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@Glowbike
Hi Harvey,
Merry Xmas.
Tried Mapp? Using a similar process to yours I've used it and a plumbers torch to attach caps to heads before. It's more expensive than acetylene for sure, but it's a whole load more available if you're needing it fast. Try that?
Also, something I've been wondering for a while, is there enough torque in your lathe to just spin the caps on, friction welding them solid? If it would work it would surely open up the possibility of capping uhmw?
Colin