Extracting A Broken Screw

This post is a portion of a larger Watch Project that illustrates Sellita SW210 Repair.

The best way to understand how you can extract a broken screw from a movement is to watch the video [https://youtu.be/KynGevssTjk].

I used a Bergeon 30209 with extractors (broaches) sized 0.8mm on the side with the broken head and 0.6mm on the backside so it would go into the hole and grip the screw without damaging the threads. (NOTE: I say 0.4mm in the video, but it was in fact 0.6mm.)

You tighten the tips so that they grip both ends of the screw and then turn the plate. You should turn the plate in the direction that will remove the screw from the top of the plate as you would normally remove the screw. (NOTE: In the video I use the terms plate and bridge somewhat interchangeably as this is the main plate/bridge and the specific screw broken is the minute train bridge screw.)

Before & AfterThe damage around the hole already existed and was not caused by the Bergeon tool. I will clean it up a little and when assembled the scratches will be hidden by the minute train bridge.