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This is a precision regulating tool specifically designed for the Audemars Piguet Caliber 3120, 3126, and 3090 automatic movements – a professional instrument for watchmakers to fine‑tune the rate of the free‑sprung balance. The three AP calibers share the inertia‑type regulation philosophy: Caliber 3120 (introduced in 2003), 3126/3840 (based on 3120 with a chronograph module), and 3090 (a manual‑winding ultra‑thin caliber launched in 2000) all feature adjustable weights or screws on the balance rim to adjust the moment of inertia, thereby regulating the daily rate.
The 3120/3126 balances carry eight heavy screws, while the 3090 uses a four‑weight Gyromax system, but both are adjusted by rotating the respective elements using this dedicated tool. The tool is made of refined steel with precisely machined tips to securely engage the adjustment slots, making it an indispensable instrument for professionals servicing AP movements.
Precision fit: Specifically designed for the adjusting screws or weights on the balance wheels of AP Calibers 3120, 3126/3840, and 3090, with tips precisely matching the adjustment slots.
Refined steel: Made of high‑quality refined steel, durable, surface‑hardened, and resistant to wear over long‑term use.
Regulation principle: By rotating the eccentric inertia screws/weights on the balance rim, the centre of mass shifts, increasing or decreasing the moment of inertia to fine‑tune the daily rate.
Compatible calibers:
Caliber 3120: 40 jewels, 21,600 vph (3 Hz), launched in 2003, fitted in Royal Oak references 15300, 15400, etc..
Caliber 3126/3840: Based on 3120 with a Dubois‑Dépraz chronograph module, 29.92mm diameter, 59 jewels, 3 Hz, replaced 2226/2840 in Offshore chronographs from 2007.
Caliber 3090: 9‴ (20.8mm) diameter, 2.8mm thick, 21 jewels, manual‑wind, launched in 2000, fitted in Jules Audemars collection, featuring a Gyromax regulation system.
Effect of adjustment: Rotating the inertia weights enables highly precise rate correction – typical resolution is approx. 1 or 2 seconds per day per scale mark/pair of screws.
Professional value: Free‑sprung balance regulation is a core skill in high‑end watchmaking; this tool offers an affordable yet reliable solution for watchmakers.
| Specification | Details |
|---|---|
| Product Name | Balance Regulating Tool |
| Compatible Movements | Audemars Piguet Caliber 3120, 3126/3840, 3090 |
| Balance Type | Free‑sprung inertia balance |
| Adjustment Object | Inertia weights / adjusting screws (8 or 4, depending on caliber) |
| Material | Refined Steel |
| Origin | China / Aftermarket |
Q1: Is the regulation method the same for Calibers 3120, 3126, and 3090?
A: The principle is the same – rotating the weights changes the inertia balance‘s moment of inertia to adjust the rate. The 3120/3126 balances typically carry 8 adjustable inertia screws; the 3090 uses a Gyromax system with 4 weights. This tool is compatible with both designs, but the number of adjusting points varies accordingly.
Q2: Can I use this tool to adjust my AP watch rate at home?
A: Strongly not recommended for amateurs. Balance adjustment requires solid theoretical knowledge and years of hands‑on experience. Improper operation can easily deform the weights, unbalance the balance wheel, break the balance staff, or damage the hairspring, leading to costly repairs. Leave this task to a qualified professional watchmaker.
Q3: What if I accidentally misadjust the inertia weights?
A: First, document the notch orientation of each weight. Then test the movement on a timing machine across multiple positions. If you cannot restore the original settings, send the watch to an authorised Audemars Piguet service centre, where a technician will recalibrate the balance using a dynamic poising machine.
Q4: Can this tool be used on other Audemars Piguet movements besides 3120/3126/3090?
A: This tool is specifically designed for the above three calibers. For other AP movements (e.g., Caliber 4401, 4302), the dimensions and shapes of the inertia weights may differ. Do not mix, as this could damage the tool or the movement parts.
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