Drill jig for drilling/reaming rear spar/fusalage hole

[Philip Cobbin]

I wanted to get this critical hole right the first (and only) time you get to drill it. This jig uses a drill and reamer bushing to make sure the holes are square to the spar and go centrally located to stay well within Van's minimum edge clearance specifications. The notch on the jig body serves to locate the jig vertically against the F-705B center section bar.