Black polishing screw heads — an old G. Boley tool, and a question about laps

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First post here, so a short hello: I'm not the watchmaker. I work with
one — he restores antique movements and builds marriage wristwatches,
and I handle everything that isn't a lathe. More in my profile.

He's been finishing screws for a Ulysse Nardin build this week, and the
process turned out to be more photogenic than I expected.

Image

The holder is an old G. Boley: brass body, graduated notches for
different head diameters, one clamping screw on top. It…

Black polishing screw heads — an old G. Boley tool, and a question about laps

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