jim; i agree with u,i have thread gages at work will double check thread size;
phil;i used the hollow screws thats what caused the problem,there was a burr on the bottom where the slot is cut,it threaded in fine but when i removed it,threads were pulled.
gts don ; yes if i have to i will buy a new body,this carb i have now has alot of work just trying to fix it if i can.

comp;thanks thats what i was thinking was 12-28 thread.
thanks for the help guys i will now try to find a heli-coil kit in 12-28 .thanks mike