Shooting sounds good. I could never have gotten the obstruction with a steel punch. The brass punch had just enough give in it to bend from the nipple seat to the plug chamber when struck. I think the existing nipples , which are a bit ragged, are metric sizing. Closest I can come to is metric 7 x 1.0 .

Last edited by Daryl Hallquist; 06/24/24 12:33 PM.