Ahhh, the Zastava M57, which is a more or less clone of the Tokarev TT33, but with a longer grip and a 9 round magazine, which by the way can be hard to find, and most of these shipped with only one magazine. Some of these were modified with a glock style trigger safety dingus, but not all were so modified.
Classic Arms was the major importer of these as I recall.
I haven't heard of any recent imports of them with this style of safety, and most who got one soon swapped in the original trigger to get a slightly better trigger pull.
Ive got a Romanian too. Had to cut up a drill bit to plug that hole, and the hole that somehow happened shooting it when the firing pin retention pin blew out the side and shipped the springed pin into my face. That was fun. I know this is an old thread but if anyone's interested the right size is the second smallest allen wrench. Cant think of the size off the top of my head. 4/32 maybe but that cant be right. The safety hole is one size up iirc. Loctite for a temporary rig, spot weld and sand for permanent. The drill bit generally matches the bluing anyway but you can cold blue it before insertion.
Or spend 4 bucks on a new part IF its in stock anywhere. I see theyre around now.