I had a local machine shop fabricate a drill guide from 3/16" up to the 5/16" hole. Went to a local store and purchased a 5/16 reemer and after checking everything on the fuselage for level, no forward or aft wing sweep, and double checked level locations and measured from center of fuselage, I fet satisfied that everything was where it needed to be I drilled the rear spar attach holes and temporarily installed AN5 bolt and nut
