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some just don't want to cave
like the 'o..ld' wire wrapper wires' one.Do you remember the 'V' slot blades for stripping 30AWG Kynar for wire wrap? Searching for a link . . .
EDIT:
This is how we built prototypes in the 80's - Much faster than soldering as no wire prep is necessary and the wire is spun on with an PTX-1BF electric tool like in the stripper link - better mechanical and electrical connectivity as the wire cuts into the square post.
EDIT:
PTX-1BF
I the temperature adjusted? Some insulations need more than others to yield.. ;-; ... and some just don't want to cave, even not with mechanical cutting ones,... like the 'o..ld' wire wrapper wires' one.