Low amplitude. Again!
I’ve just serviced the same Unitas calibre 6380 for the second time around trying to find out what’s causing its low amplitude. In the horizontal positions (dial up/dial down) the amplitude is approx. 245 degrees and in the vertical (pendant) positions about 200 degrees.
I’ve checked and adjusted just about everything I can think of from the mainspring arbor to the balance staff pivots but without any noticeable difference. The last thing I checked (and that I often have ignored) was guard
So, I finally got the time to return to my low amplitude Unitas 6380.
You were right about that John. There was plenty of room to push both pallet stones back. I didn't just warm them but re-shellac:ed them. The reason for doing that was twofold. Firstly, I wanted to try my newly bought shellac flakes (from CousinsUK). Secondly, it was easier, or at least appeared to be easier, to adjust the lock depth before applying the shellac. The shellac flakes is th
