Prechamber Mod "Flame" Front
Prechamber Mod "Flame" Front
From the pic it looks ok, but check the bar in the center of the chamber and be sure it is tight.
Personally I drill out all the holes but the bottom one as you mentioned, that is drain hole. You will get lots of different recommendations here as some will say only do the big three holes, some say do them all, and some say don't do any of them lol