Started assembling Elevator, riveted Tip Ribs, had missed the 6X end dimples (can't use DRDT, needed pneumatic squeezer) Also, sub-skin dimpled 6X holes at skin/counterweight overlap. Seems rivets don't sit as flush after expoy primer, unsure if from under dimpled or excessive primer. So I re-dimpled one set of counterweight skins, appears to have helped. (Cannot feel any rivets with rub test before re-do, but was optically annoying) Ran short of about 5X -5 rivets for doublers. unsure why, maybe too many previous misteaks. Ground down a few -6 rivets to length to make up difference. Will order more just for stock. Elevator horns, little tough to install rivets into holes, again, suspect too much primer in holes, scraped out primer for install, and actually just reamed a few holes. Prepped back rivet plate and re-waxed.