Test drill and rivet skybolt open receptable holes to 11/16 using unibit use AN426AD4-5 and -6 hard rivets to rivet receptacles in drill lower and top outside panel holes to 15/32 - unibit skybolts are very nice...well built easy to use; no instructions to speak of...need to piece it together and just try them....I made up a test piece from scrap carbon cowl material an did the whole process on the test
