Originally Posted by mike newall
Having just finished two RV12's and thoroughly enjoyed the process, I can say that you will end up clearing about 25% of holes, particularly on wings or whenever the skins are taking a reasonable curve.
Never bothered with a reamer, sharp new super cobalt, as others say, you sometimes can't see anything coming off and I think it is the variance of the pulled rivets.
Indeed, there is a fair amount of variance in the diameters of the LP4-3 rivets. I have a box labeled FAT FOURS where I put these for later use in holes which, for whatever reason, seem loose. When a rivet won't go, I first try a different rivet.