Match drilled the F644 ribs to the hinge block. The bolts were inserted to locate the hinge blocks then clamped in place. The top skin F771 was installed to properly locate the 644 ribs. Once done, I removed one bolt at a time and drilled the 644 rib. *All holes completed except for the 1/4"*
After ordering the one eared plate nuts from Aero Performance, Joe Crosswell let me have a couple from his stash. Riveted the platenuts on the F721C and then attached it to the F721A
