Hi Lorne , I was waiting for one of the pros to answer , having worked on machinery my whole life , I am familiar with repairing larger bolts and threads , using helicoil , inserts , welding and drilling , I would think on watches that if going a little larger is not practical , maybe you could close the hole and re-tap , I have yet to encounter it and would like to hear their answer.
Posts: 1574 | Location: Maryland in the USA | Registered: June 04, 2015