Originally Posted by
rustguard
I think you will find that eyelets are M5 not 6.35mm and if you mean pop rivets they simply do not take shear loading so are usless
Froze was talking about rivnuts not pop rivets.
Different beasty all together

But I wouldn't drill a hole in any frame. Not worth compromising the frame.
Chansnewbike, there are lots of ways of proceeding without resorting to drilling. Old Man Mountain makes racks that work without eyelets. Tubus makes adapters. They even make a better p-clamp. Check the
Touring Store And the other guys were talking about using a reflector clamp
and a bit of bending to fashion the right sized p-clamp.