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This is the Horotec MSA07.368 Professional Rack-Press, specifically designed for opening and closing screw-on case backs. The tool includes 1 case holder (62mm) and 7 suction dies of various sizes, featuring an innovative rack-and-pinion design and special synthetic deformable dies. The metallic parts of the tool never contact the watch during operation, completely eliminating the risk of scratching.
Genuine AP Part – Swiss factory-original, perfect fit for Caliber 3120/3126.
Winding System Core – Transmits crown torque to the mainspring barrel.
Precision Machined – High-accuracy gear teeth and sliding surfaces for smooth winding.
Essential for Service – Replace when winding slips or fails, or when keyless feels vague.
Cross-Caliber Compatibility – Fits both base 3120 and chronograph 3126 movements.
| Parameter | Details |
|---|---|
| Part Name | Winding Pinion |
| Reference | Audemars Piguet 50 |
| Compatible Movements | Caliber 3120 (automatic base), Caliber 3126 (automatic chronograph) |
| Function | Transmits crown winding torque to the mainspring system |
| Origin | Switzerland |
| Condition | Brand new, genuine |
AP Caliber 3120 (e.g., Royal Oak 15400, 15300)
AP Caliber 3126 (e.g., Royal Oak Offshore chronograph models)
Replacement of worn, broken, or damaged winding pinion during movement service
Repair of slipping crown, inability to wind, or abnormal winding feel
1. Is this a genuine Audemars Piguet winding pinion?
Yes. It is a Swiss factory‑original part (ref. 50) for Caliber 3120/3126, not a copy.
2. What are the symptoms of a damaged winding pinion?
Symptoms: the crown spins freely when winding, no winding action; manual winding fails but automatic winding may still work; grinding or sticking during winding; vague keyless positions.
3. What should I pay attention to during installation?
The winding pinion sits on the stem. Clean the keyless works before installation. Test smooth winding and setting mode switching after assembly. Follow the AP technical guide. Professional installation is strongly recommended.
4. Does this part fit Caliber 3125?
Caliber 3125 is based on 3120 and typically shares the same winding pinion, but verify with the parts diagram. This part is specified for 3120/3126; confirm compatibility for other calibers.
5. Do I also need to replace the clutch wheel?
Not always. If the clutch wheel teeth are also visibly worn (rounded or deformed), replace both for optimal keyless performance.
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