Okay. So, light a candle. take some of the melted wax and rub it on the inside of one reciever half. Actually, forget wax, use like. . . vaseline, or any kind of lube or oil or whatever. Then, use a putty (is J&B Weld a putty?) that bonds with metal and put it all over both reciaver halfs in the vicinity of the hole (:blink:OMFG). Let it dry or whatever it does. Then the reciever half with the lube should come off, and the other half will have a block that fits perfectly and can be tapped.
Thank you! I will try this.. Do you know a definate name on a putty?