Spent a fair amount of time prepping the HS parts for primer. I de-vinyled the skins, deburred all holes and filed down all edges. Then I cleaned up all the edges with the 3M wheels. Did a good scuff with scotchbrite and wiped down with MEK. The primed the parts. After supper I headed back out to the garage and started to rivet the front spar assembly. The result was excellent work but very labor intensive.