Who is our resident watchsmith?

[chuckmiller]

I have a question on regulation of the ETA 2824.

[wschofield3]

And that question would be?

[chuckmiller]

The screw you turn for fine adjustment of the hairspring. Is the slot in the screw head a standard shape or can it be unusual? Like half moon dished?

[skywatch]

I'm no watchsmith, but I have regulated a few 2824 and other movements. A standard small jeweler's screwdriver should work - very small, flat bottom. The radius to turn for a few seconds per day is about the smallest movement you can possibly make. It's not as sensitive as turning a Seiko small tab, but it is rather sensitive. To its credit, most standard 2824s can get almost COSC with a good tiny tweak.

[chuckmiller]

A better, proper, Bergeron screwdriver tip worked. I am befuddled as to why my other nearly identical tips would slip out of the screwhead.

[geoffbot]

A better, proper, Bergeron screwdriver tip worked. I am befuddled as to why my other nearly identical tips would slip out of the screwhead.

Because tolerances!