I used my router to route 4
small slots into the front shoulder support piece. This allowed the
piece of aluminum, which the nut plate for the shoulder harness bolts is
riveted to, to "key" into this slot, thus, preventing it from rotating.
In this manner I was able to install those aluminum pieces, after the nut
plates were installed, before I did the inside layup or installed the should
support into the fuselage. This prevented having to cut holes into the
shoulder support when those pieces are installed.
I made this "jig" out of
corrugated paper to hold the shoulder rest while it started to set up.
Not easy to see here, but present, are the aluminum pieces mentioned in the
step above.
