Don’t mean to be harsh, but drilling out the broken screw, tapping the hole, and “making” a new screw is just a nonsensical approach to fixing this. Alum would have done the job easily, and the screws for affixing the friction spring to the barrel are readily available and cost about $7 each.
She was clearly in way over her head on this watch, and was not equipped to solve what are really minor problems in an efficient way.
I’ve had nightmare watches before, so I can sympathize with her fretting about a watch over a period of time, but she was her own worst enemy on this one.
These really aren’t that difficult to work on to be honest, with most of the movement being the same as an 861...
Cheers, Al
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