Accomplished final drilling of the W-423 joint plate, and leading
Tip: The plans are not very specific regarding this so here is what
works. Do one thing at a time, measure and draw the 1/2" line down the joint
plate like the plans say to. Align that line with the holes in the leading
edge, drill the joint plate moving from the underside through the top, and
cleco as you go. Then remove it from the leading edge. Do the same for the
rib . Draw a line down the center of the rib web insert the rib
into the leading edge and mark the holes using the skin as a template. Remove
the rib and flute it. Reinstall the rib and line up the center line with the
holes in the skin. Drill the holes the same way as the joint plate.
Remove the rib and final drill everything once again. It should look
something like this. Final drill all other leading edge ribs.
Using the die grinder and ending with the unibit enlarged the tie town
hole to 3/8".