http://www.tognar.com/helicoil-screw-insert-kit/

there's a couple places that sell a helicoil kit. you're in at least $100 no matter where you go. probably a worthy investment if you mount a lot...

i mounted some marker dukes all by my fucking self on some heavily drilled armada JJs. i got a spinner, so i filled it with machinable epoxy mixed with steel wool, let it cure, drilled it, and...