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This is a precision‑made balance wheel regulating tool holder manufactured by NBR, designed specifically for the Longines Caliber L888 automatic movement. The tool holder provides secure and stable support for regulating and adjusting the balance wheel, helping watchmakers maintain component stability when adjusting the hairspring, regulator, or performing static poising. It is a professional aid for achieving precise regulation when servicing the Longines L888 caliber.
Designed for Caliber L888 – Perfectly fits the balance wheel and regulating geometry of the Longines L888 movement.
Stable Support – Prevents accidental movement of the balance wheel when adjusting the regulator or balance screws.
Protects Delicate Parts – Avoids contact with the hairspring or balance staff during adjustment, reducing damage risk.
Easy Operation – Precisely aligns with the balance bridge and regulating system to streamline the regulation process.
High‑Quality Construction – Manufactured by NBR to meet professional watchmaking standards.
| Parameter | Details |
|---|---|
| Compatible Movements | Longines Caliber L888 (including L888.2, L888.3, L888.4, etc.) |
| Product Type | Balance wheel regulating tool holder |
| Brand/Manufacturer | NBR |
| Material | Metal (precision machined) |
| Function | Secures balance wheel for regulating/adjustment operations |
Servicing Longines Caliber L888 automatic movements (found in Conquest, Master Collection, La Grande Classique, etc.).
Adjusting the regulator or balance screws to correct timekeeping accuracy.
Providing stable support during balance wheel static poising.
Professional watch workshops, brand service centers.
1. Is this a genuine Longines tool?
No. It is a high‑quality third‑party tool made by NBR, specifically designed for the L888 balance regulating system, and is functionally equivalent to the original.
2. Which movements does it fit?
It fits all Longines Caliber L888 variants (L888.2, L888.3, L888.4, etc.). The L888 is based on ETA A31.L01, and all versions share the same balance dimensions.
3. How do I use it?
Place the balance assembly into the tool‘s corresponding slot to secure it, then use a regulator wrench or balance screwdriver for adjusting. Use a timing machine and loupe for best results.
4. Is the material durable?
Made of precision‑machined metal with surface hardening, offering excellent wear resistance and anti‑deformation properties for long‑term daily use.
5. Does it work on earlier calibers like L619?
No. The L619 has a different balance bridge and regulating design – not compatible.
Fast worldwide shipping within 3 business days.
Competitive pricing on Seiko/Hattori calibers.
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