Reply To: Watch slows down when tilted to 3:00 position

[randy]

Could be a few things.
I always start by looking at the balance as it’s moving, in the various positions, to make sure that the hairspring isn’t dragging on the balance cock,.or hung up in some other fashion.
If all looks good there, I try re-cleaning the pivot jewels, then re-oiling. Sometimes you don’t get all of the previous gunk out of them, and they can cause loss of amplitude.
You can also try loosening the balance cock screw a bit ( while the watch is running ), and very carefully lift the balance cock a bit to see if it cures the problem. If it does, the pivot may be too long,and bottoming out on the cap jewel.
But this normally only occurs if you’ve re-staffed the balance.

Good luck,..let us know how it turns out !

Regards,

Randy