This shows how they are used to align the spar parts for drilling and riveting.
I also started marking the taper in the spar caps. I made 1 cut. I used a jigsaw and actually had a lot of luck with a reciprocating saw. I will have to sand/rout the edges smooth, but the cuts are still faster than the 4130 cuts.
The taper is hard to see, but the spar cap goes from 1.5" to 1" over a 20" span. Rumor has it, this removed about 3 lbs of unnecessary weight.
Today I used the Harbor Freight Digital Caliper to make my jig. It might have been overkill, but was happy to try it out. Not bad for $18.
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