Well, if all else fails, find some brass rod that fits inna hole and cut some off. Clean out the hole with a pipe cleaner and alcohol. JB Weld the brass piece you just cut, into the hole. WAIT 24 HOURS. Go Shoot.
Forgot: Lowes, Ace, Home Despot, Michaels, places like that for Brass Rod Stock. A stick will last ya pret'near forever.