The Bergeon 4733 is a precision tool crafted from high-quality steel and designed specifically for watchmakers to firmly grip and precisely tighten the cannon-pinion on wrist watches. Featuring a regulated opening system, adjusted by a finely knurled side screw and secured with a locking nut, it ensures accurate and controlled tightening without damage to delicate pinions. With an overall length of 120 mm, the pliers offer ergonomic reach while maintaining stability on the bench. Built by the trusted Swiss manufacturer Bergeon, this tightener is engineered for use in demanding repair tasks where precise friction control is essential, such as ensuring the correct fit of the cannon-pinion for hand setting and central-wheel alignment. The regulated adjustment mechanism allows the user to set an exact opening span before clamping, reducing risk of over-compression and part damage. Whether you’re servicing high-end mechanical watches or performing intricate restoration work, the Bergeon 4733 gives you the control and reliability needed to execute work confidently and consistently.

Bergeon No.4733