Dear all my friends, I have a problem I want to ask. I was training to service a watch and my mentor gave me a brand new orient movement (46943). I measured the amplitude of the movement to 260-270 before but after cleaning and oiling the movement dropped the amplitude to 220, even 180 when I changed positions, I spent a lot of time to check each small part, all parts are okay, the pivot is not damaged, the balance wheel still works well, i clean absorber again and again, but can't improve the amplitude. After this, my instructor spent lots of time to check again but look like he don't know wh