Yes, I believe soldering is the best way to re-attach that and I think Mumbles commented on that not too long ago. But I’ve also seen some that were secured with what I believe was 3M 847 or similar, that showed no sign of leakage. As far as the nylon washers that go on after a couple of the cork packing, I’ve gotten them from McMaster Carr and they’re a perfect substitute.
https://www.mcmaster.com/catalog/129/3630/95606A420
Part #95606A420
Nylon Plastic Washer, Number 12 Screw Size, 0.25″ ID, 0.375″ OD, 0.026″-0.036″ Thickness
