[Pastor]

Can you post a picture of the notches of both the old and new spear shafts? I'll be honest with you, I have never ever heard of anything like this. Unless this guy made the shafts out of a bit of old bar and a grinder then any euro shaft would fit. Are you sure this is the shafts and not the gun that has been damaged? Have you tried the original shaft back in the gun to see if that cures the problem?