I finally managed to get a few rivets to turn out right, just started tapping too hard I guess. The only problem I have now is the rivets I have from my local leather shop are too short to clear the kydex when used in a molded area, like the hilt of my Dereg. They're barely long enough to seal two flat pieces of Kydex together. Going to have to find another source for them, these aren't cutting it.