Got the 55 in bits yesterday. Serial 80639 suggests 1960 so a lot younger than me and in similar nick.
Queries are i) should it be leather seal ii) is the piston modified iii) were all trigger blocks threaded for guide iv) will any other cocking arm fit ?
TP is 4.5 mm, bore 25 mm stroke 71 mm so should make power OK but may need TP throttling a bit if synthetic seal retained??




Thanks for looking.