Hello all. My first post. Hope I can get some help. First, the watch, Waltham 18S, 17J, P.S. Bartlett, Model 1883. Replaced balance staff, balance bridge hole jewel, plate pallet jewel. Cleaned, oiled. On full wind with the original mainspring I get an amplitude of ~200 in DU, DD, PL, PD, PR, but in Pendant up position the watch nearly stops, and does stop when not at full wind. Looking between the plates at the movement, the roller table, roller jewel, pallet jewels nothing stands out as wrong. Hoping someone has had a similar experience and found out the correction. Thanks in advance.
Most visitors online was 1660 , on 12 Dec 2020