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.)
Before & After