As per Roger's recommendation, I'm drilling
out this main spar attachment hole now
before the wing is assembled.
I wanted the hole perfect so I leveled
the spar and drilled it out with the drill
I used a few different drill bits to work up
to the 3/16" final size.
Here's an AN6 bolt sitting nicely in the
Next task is to rivet the spar extension to
the spar. The two 3/16" bolts are there just
to hold it all together while riveting.
There's no nuts on the bolts. One could also
use 3/16" gold clecos but the bolts are a
little more accurate than clecos.
Just another pic. I didn't rivet them yet as
I was rushing out for evening plans...