Repair Tool (Model: 8008), Black

We form this opening ball from supple black rubber with a diameter of 67mm. It relies on surface friction rather than steel pins to grip the caseback. You press the ball firmly against the metal and turn by hand. Catalogue number 8008 sits on the bench for unscrewing threaded backs once broken free.

Grip on metal

The pliable surface conforms to flat, domed, or polygonal screw-on backs under downward hand pressure. It grips the metal without using steel pins or biting edges. You twist the sphere directly against the case.

Handling the sphere

The 67mm diameter fills the palm naturally during a turn. It gives you a broad contact area across the rear of the watch. You adjust your turning force by modulating how hard you press into the case.

Workshop practice

Use this tool for spinning threaded backs open once initial stubborn torque is broken, or for running them down before final seating. It leaves no metal shavings or debris in the case threads. Keep it away from bench oils.

Bench care

Rubber collects loose bench dust and metal filings over time. Wash the sphere occasionally with warm water and plain soap to restore the tack of the rubber. Dry it completely before bringing it back near an open movement.