If you’re talking about the screw holes in the main body for the screws to attach the bowl, they’re 12-24 thread.
There are hemi-coil kits for that thread.
The early Demons didn’t have hemi-coils there, and since the bowl screws were really “too short”, they stripped out easily.
I have seen bodies that were repaired using 1/4-20 and 1/4-28 inserts, and then use new hardware to match.
There must have been plenty of complaints about the stripped holes, since they started coming with heli-coils installed at some point.
