Since 1983 I've owned 120. Only 2 have I had problems with. A 177 they couldn't make any power and one where someone had overscrewd the front lugs to...
Not sure if there are any electronic experts here the Skan Chronograph i bought years ago now seems to show now and then negative results from shots...
I can envisage no issues with nylon washers, although my preferred material of choice would be polished steel ones with a little moly grease. Acetal...
Yes it would be better without the jazz club. I cannot believe he got away with a full length Titan and it does not appear to jump out of his hands....