I have some 2018s.  I need to know what thread size are the inserts.  Some of my field tips and broadheads will not screw in.     so please bear with me.  any helps?  thanks in advance   <><  del

An 8-32 tap will clean them up.

They are ALL 8-32.  Just clean them up as blackstick recommended.  You can also try an 8-32 machine screw if you don't have a tap.  You can also use an 8-32 nut on the threads of your tips if they need cleaning up (or an 8-32 die if you have one).

Thanks guys.  This has been very frustrating.  <>< del