Oct 27, 2026Reference & Sizing
Caliber-Specific Watch Movement Holder Guide: 2892, 2894-2, 7750 and Multi-Function Clamps
Identify caliber-specific watch movement holders for ETA 2892-A2, 2894-2, and 7750 alongside dual-purpose clamps. Compare dimensions and send your caliber for verification.
A watchmaker's movement holder matches the mechanical architecture of an uncased caliber, avoiding bench guesswork. Placing an uncased movement on a flat block or inside an improper clamp risks severe damage. Downward pressure during hand setting, bridge screw tightening, or lever adjustment bends balance pivots, crushes arbors, or distorts fragile calendar plates. While generic vises grip external rims, complex automatic movements and chronographs feature pushers, date rings, and levers extending past the mainplate. Dedicated caliber-matched holders provide milled recesses, locating pins, and clearance pockets tailored to specific movement families. This guide details holders catalogued for calibers including the ETA 2892-A2, 2894-2, and 7750, alongside dual-purpose reversible clamps, multi-caliber rotatable sets, and oversized casing vices.
Watch Movement Holders for Specific Calibers: Matching Stated Designations
Selecting a movement holder begins by distinguishing between universal adjustable vises and caliber-specific fixtures. Our companion guide on multi-size adjustable movement holder sets reviews general-purpose clamps for flat mainplates. However, automatic movements and chronographs demand targeted clearance and solid underside support.
In a caliber-specific holder, the mainplate drops into a precision recess or rests upon support pins. This orientation shields delicate escapement components, hairsprings, and stems from uneven clamping stress while resisting axial pressure from screwdrivers and presses.
Before mounting a movement, confirm the caliber number stamped beneath the balance wheel or engraved onto bridges. If markings are absent, measure the bare mainplate diameter and overall height before matching to catalog specifications.
Chronograph and High-Complication Calibers: Stated Holders for ETA 7750, 7758, and SW500
Automatic chronographs present support challenges because reset hammers, levers, and cams span multiple plate levels. Clamping these calibers in flat jaws pinches peripheral springs.
Kocandy provides a dedicated holder catalogued for ETA 7750, ETA 7758, and SW500 calibers in the 13 1/4''' dimension under model RH00823749. Constructed from anodized aluminum, this 150-gram fixture features a 31 mm base diameter, with dimensions recorded as 3 inches in length and width by 1 inch in height.
Hardened steel support screws with polished tips support bridge plates from beneath without scratching. Radial slots clear chronograph pushers and date mechanisms, protecting the balance assembly during hand setting as discussed in our watch rotor and balance wheel tool guide.
Anodized aluminum movement holder stated for ETA 7750, 7758, and SW500 calibers.
Slim Automatic Calibers: ETA 2892-A2 and Modular Chronograph 2894-2 Holders
Ultra-thin calibers require dedicated support points to prevent plate flexing. The ETA 2892-A2 measures just 3.6 mm high, where lateral clamping binds the gear train.
Our catalog lists a dedicated copper holder for the ETA 2892-A2 with silver and gold plating, weighing 110 grams. It features an engraved "2892A2" face, a locating pin, and a storage box with screws and a screwdriver tip.
For modular chronograph executions, Kocandy catalogs a copper holder for the ETA 2894-2 (110 grams) with three locating pins and an accessory box. Because the 2894-2 adds a dial-side chronograph module, the fixture provides specific clearance depths to avoid intermediate wheel contact.
We also catalog a 110-gram stainless steel holder listed under ETA 2892-5100 with a brass insert. Because 2892 and 5100 represent distinct lineages, verify bridge clearances before ordering.
Dedicated copper movement holder engraved for ETA 2892-A2 calibers with locating pin.
Rotatable Multi-Caliber Turret: The 7-in-1 Movement Ring Base
Workshops handling diverse mechanical calibers require rapid transitions between movement types. The 7-in-1 rotatable holder set provides a comprehensive solution for standard workbench dimensions.
The system features a heavy stainless steel rotating base plate and seven interchangeable movement holder rings, weighing 360 grams. The catalog states compatibility across six primary calibers: ETA 2000, 7750, 2824, 2671, 3100, and 8500.
The turntable enables smooth 360-degree rotation during assembly, allowing watchmakers to access casing screws and bridges without lifting the workpiece. If you encounter an unfamiliar ebauche, consult our watch movement caliber identification guide to confirm plate dimensions before mounting.
The 7-in-1 stainless steel movement holder ring set with rotatable bench base.
Dual-Purpose Reversible Clamps: Model 4040 and 4039 Ligne Sizing
When dedicated caliber rings are unavailable, dual-purpose stepped clamps offer reliable stability. Kocandy lists the model 4040 and 4039 alloy clamp set under catalog number SP00000923.
Machined from metal alloy, this two-piece set weighs 50 grams with a stated length of 9 cm and height of 8. Reversible stepped jaws provide dual capacity ranges:
- Model 4040: Stated for 8 3/4''' to 19''' (approximately 19.7 mm to 42.8 mm).
- Model 4039: Stated for 3 3/4''' to 11''' (approximately 8.5 mm to 24.8 mm).
One jaw face features a shallow step for clamping thin movement edges clear of date wheels, while the reverse side provides a deeper lip for thicker bridges. Threaded guide pins ensure smooth, parallel opening.
The 4040 and 4039 dual-purpose alloy movement clamp pair covering 3 3/4 to 19 lignes.
Multi-Function Brass and Stepped Clamps: Two-Piece and Four-Sided Sets
Brass and copper movement holders act as sacrificial surfaces, preventing scratches on steel movement plates and plated bridges.
The Kocandy catalog includes a 2-piece brass clamp set (150 grams) providing Size L (4 x 3.9 cm) and Size S (3 x 2.8 cm) with reversible jaws. For complex positioning, our four-sided brass clamp (110 grams) shares the Size L and Size S dimensions, adding four distinct profiled edges (sides A, B, C, and D) with knurled screws.
For broader range, our 3-in-1 zinc alloy set (170 grams) supplies three square vises: 45 x 45 mm, 37 x 37 mm, and 25 x 25 mm. In addition, the lightweight 2-in-1 synthetic holder (55 grams) features reversible jaws for bench vise clamping. When handling miniature components in these fixtures, select non-magnetic tools using our watch tweezer tip size guide.
Oversized Movement Clamps and Case Vices: 45 mm and 60 mm Capacities
Pocket watch conversions, oversized modern sport watches, and complete case assemblies exceed standard holder dimensions, requiring heavy-duty casing vices and wide clamps.
Kocandy provides a 45 mm adjustable case and movement holder under model SP0000437. Measuring 82 x 48 x 36 mm and weighing 100 grams, this plastic and metal tool features four rubber pins gripping cases and spacer rings up to 45 mm without marring finishes.
For larger pieces, our extra-large vice clamp handles movements and cases up to 60 mm in diameter. Weighing 260 grams, this fixture features four adjustable support legs controlled by a central knob. Catalog specifications record dimensions of approximately 11.5 cm by 9 cm, providing rigid stability during high-torque casing operations.
Caliber and Holder Matching Reference Tables
The reference tables below summarize specifications, dimensions, materials, and catalog model numbers across all caliber-specific holders, multi-function clamps, and casing vices in scope.
Table A: Caliber-Specific and Rotatable Holders
Product | Stated Caliber or Ligne | Construction Material | Key Snapshot Specs & Features | Catalog Link / Model |
|---|---|---|---|---|
ETA 7750 Movement Holder | ETA 7750, 7758, SW500 (13 1/4''') | Anodized aluminum | 31 mm base diameter, hardened steel support screws, weight 150 g | ETA 7750 movement holder / Model RH00823749 |
ETA 2892-A2 Movement Holder | ETA 2892-A2 | High quality copper | Engraved 2892A2, locating pin, box and accessory screw kit, weight 110 g | ETA 2892-A2 movement holder / Confirm by message |
ETA 2894-2 Movement Holder | ETA 2894-2 | High quality copper | Three locating pins, module clearance, box and accessory kit, weight 110 g | ETA 2894-2 movement holder / Confirm by message |
ETA 2892-5100 Movement Holder | Stated as ETA 2892-5100 | High quality stainless steel | Brass center insert, box and accessory screw kit, weight 110 g | ETA 2892-5100 movement holder / Confirm by message |
7-in-1 Rotatable Holder Set | ETA 2000, 7750, 2824, 2671, 3100, 8500 | Stainless steel | 1 rotatable base plate plus 7 movement rings, total weight 360 g | 7-in-1 rotatable movement holder set / Confirm by message |
Table B: Multi-Function, Dual-Purpose, and Vice Clamps
Product | Stated Configuration | Body Material | Stated Dimensions & Weight | Catalog Link / Model |
|---|---|---|---|---|
Model 4040 & 4039 Clamp Pair | 2-piece set (4040: 8 3/4'''-19'''; 4039: 3 3/4'''-11''') | Metal alloy | Length 9 cm, height 8, weight 50 g | Model 4040 & 4039 clamp pair / Model SP00000923 |
2-Piece Brass Clamp Set | 2-piece set (Size L and Size S) | Copper / Metal | Size L: 4x3.9cm; Size S: 3x2.8cm; weight 150 g | 2-piece brass clamp set / Confirm by message |
Four-Sided Brass Holder | 2-piece set with sides A, B, C, D marked | Brass and steel | Size L: 4x3.9cm; Size S: 3x2.8cm; weight 110 g | Four-sided brass holder / Confirm by message |
3-in-1 Zinc Alloy Clamp Set | 3-piece set (45 mm, 37 mm, 25 mm square) | Zinc alloy | 45x45 mm, 37x37 mm, 25x25 mm; weight 170 g | 3-in-1 zinc alloy clamp set / Confirm by message |
2-in-1 Synthetic Movement Holder | 2-piece set in blister packing (two sizes) | ABS plastic (spec notes alloy) | Reversible dual-sided jaws; weight 55 g | 2-in-1 synthetic movement holder / Confirm by message |
45 mm Adjustable Case Holder | Single holder with rubber pins | Plastic and metal | 82x48x36 mm, holds up to 45 mm, weight 100 g | 45 mm adjustable case holder / Model SP0000437 |
Extra-Large Movement Vice Clamp | Single vice with 4 adjustable legs | Metal and plastic | 11.5x9 cm approx., holds up to 60 mm, weight 260 g | Extra-large movement vice clamp / Confirm by message |
Table C: Bench Selection by Movement Architecture & Operation
Movement Architecture | Recommended Holder Type | Critical Clearance / Fit Point | Bench Rationale |
|---|---|---|---|
Automatic Chronograph (ETA 7750, SW500) | Dedicated ring with support screws (RH00823749) | Radial cutouts clear push levers; steel screws support bridge underside | Rigid vertical support prevents plate bowing under heavy chronograph hand setting pressure. |
Slim Automatic (ETA 2892-A2) | Engraved dedicated copper holder | Perimeter lip matches mainplate rebate; locating pin indexes stem | Eliminates lateral jaw pinch that binds train pivots in thin automatic movements. |
Modular Chronograph (ETA 2894-2) | Dedicated copper holder with 3 pins | Clearance pockets accommodate lower module plate and driving wheel | Avoids pressure on dial-side chronograph coupling wheels during service. |
Standard Men's & Ladies' Calibers (3 3/4''' to 19''') | Dual-purpose clamp pair (Model 4040 & 4039) | Stepped reversible jaws clear date rings and calendar components | Provides parallel screw clamping for varied plate thicknesses without marking plates. |
Oversized Calibers & Pocket Conversions (up to 60 mm) | Extra-large vice clamp or 45 mm rubber pin holder | Wide four-leg travel clears large case rims and movement rings | Accommodates oversized dimensions that exceed conventional bench vise capacities. |
Generating Your Movement Holder Identifier Before Messaging Us
To confirm holder availability or verify fitment for an unlisted ebauche, compile your movement specifications into a concise bench identifier before contacting our workshop desk:
- Movement Caliber and Stamp: Record the caliber number engraved beneath the balance wheel or on bridges (such as ETA 7750, 2892-A2, 2894-2, SW500, or vintage references).
- Bare Mainplate Diameter: Measure the widest external dimension across the bare plate with a vernier caliper in millimeters or French lignes.
- Total Movement Thickness: Measure the total height from the bottom plate surface to the highest bridge.
- Fixture Architecture: State whether your task requires a dedicated ring, a rotatable multi-ring turret, a dual-purpose clamp (4040 or 4039), or an oversized vice.
- Catalog Model Reference: Quote model RH00823749 (7750), SP00000923 (4040/4039), or SP0000437 (45 mm holder) if matching specific listings.
Sending these measurements allows our technical staff to verify clearance profiles directly against our workshop catalog before dispatch.
Workshop Inquiries and Brand Disclaimer
Kocandy is an independent supplier of watchmaker tools and replacement parts. Kocandy is not affiliated with, authorised by, or a dealer for any watch brand or movement manufacturer mentioned, including Seiko, Rolex, Omega, Citizen, Breitling, Panerai, Hublot, ETA, Bergeon, Horotec, or Vetus. References to specific movement calibers (such as ETA 2892, 2894, 7750, 2000, 2824, 2671, or SW500) and tool model numbers represent catalog stated-for specifications.
If your caliber, mainplate diameter, or fixture model is not listed above, send your measurements and markings through our contact page. We check customer inquiries directly against our workshop catalog and reply within one working day.
