This incorrect screw on the balance cock is a bad sign. Sometimes I find these screws have been over tightened into the soft brass plate and the threads ruined. Then someone puts in a larger screw. Hopefully the correct screw was just lost and I can replace it, or if not, at least find a better looking replacement.
The post on this lever (technically a "vibrating arm") was loose. These parts are actually threaded, and it's odd because the threads on this one were fine. Fairly often I see them jammed back in and dimpled punched in the top to hold it.
For some reason the upper balance jewels were extremely snug. I ended up having to use a surprising amount of force in the staking set to get them out for cleaning. I expanded the setting a little so it won't be an issue for the next person.
The balance cock screw was indeed stripped. I found a better screw with just enough grip, I hope. Running fine now.
See the album for this project here:
https://photos.app.goo.gl/rC4kULz6zUrERdox7This watch is an Elgin grade 73, 18 size, 7 jewels, made about 1894.
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