Originally Posted by
beenalongtime
When I first started with my PX4's, I had no metric punches and no luck finding any local or on Amazon. I used a (from memory), 5/64th Roll pin punch (not a regular pin punch).
One gun I did, I couldn't get the pin back in as it spiralled out like a roll of paper, or widened on the end (like a regular punch tends to do to those pins). In that case, I was frustrated enough, I took it to a local gunsmith (retired machinist), who determined I had barely made a nick in the lever itself (probably when I bent that punch), that left a burr where the pins caught.