A simple, professional rubber ball used by watchmakers to open screw-back watch cases without scratching the metal. Designed for safe, fast and reliable case-back removal.
Product overview
This watchmaker tool is a synthetic ball, approximately 6 cm in diameter, used to unscrew the case-back of a screw-back watch. The grip provided by the soft synthetic material allows the watchmaker to firmly hold the case-back and rotate it without applying metal tools to the polished surface. It is the safest manual method to open a screwed case-back when servicing a battery, changing a movement or inspecting the gaskets.
Technical specifications
- Material: high-grip synthetic rubber
- Diameter: approximately 6 cm
- Colour: assorted (depending on stock)
- Compatibility: screw-back watch cases only (not snap-back / pressure-fit cases)
- Application: opening case-backs for battery, movement, gasket or strap pin access
- Shipped deflated to reduce shipping costs; can be inflated with a ball mini-pump
When to use it
Use the watchmaker ball whenever the case-back of a watch is a screw-back type, recognisable by the small notches around its perimeter. It is the preferred tool of professional watchmakers for high-end pieces, as it avoids the micro-scratches and slips associated with case wrenches. It is also extremely useful for people who service their own watch at home, since it requires no calibration and works on Rolex, Omega, Seiko, Tissot and most screw-back cases.
How to use / install
- Inflate the synthetic ball with a small hand pump until firm.
- Place the watch flat on a clean cloth, case-back up.
- Press the ball firmly down on the case-back.
- Rotate the ball anti-clockwise to unscrew the case-back.
- Lift the case-back and proceed with the service operation.
- To close, reverse the procedure clockwise without overtightening.
Quality & origin
This watchmaker tool is selected, controlled and shipped from our workshop in France. Each item is inspected before dispatch to ensure correct dimensions and surface grip. Orders are usually shipped within 24 to 48 working hours.
FAQ
Can I use the ball on a snap-back case?
No, this tool is for screw-back cases only. For snap-back cases use a case knife.
Why is the ball shipped deflated?
To reduce volume and shipping cost. Inflate it with any standard ball mini-pump before first use.
Will it scratch my Rolex or Omega case-back?
No. The synthetic rubber is specifically chosen to grip without leaving marks, which is why it is the standard method in fine watchmaking.
Tips for safe use
Always work on a clean, soft surface to protect the case and the dial from scratches. Wear cotton gloves or use finger-cots when handling polished surfaces, since fingerprints can affect gaskets and lubricants over time. Keep your watchmaker tools organised on a dedicated tray and inspect them regularly for wear, burrs or deformation; a damaged tool is the first cause of a damaged watch. After each operation, wipe the tool with a dry cloth and store it away from humidity.
Why choose this tool
This item is selected from a long-running catalogue dedicated to professional watchmakers and to enthusiasts who service their own pieces at home. We test every reference on real watches in the workshop before adding it to the shop, so you receive a tool that we use ourselves. Combined with our French customer support, this gives you a reliable partner for every repair, from a battery change to a full strap fitting.
Is this tool suitable for beginners?
Yes. It is straightforward to use and does not require any prior watchmaking training. We still recommend practicing on an old watch before working on a valuable piece.
Do you ship internationally?
Yes, we ship across Europe and worldwide from our workshop in France, with tracked options available at checkout.
