I'm not sure why this took three days, but it did. i think i just had a couple hours here and there to work on it. the point here is to rivet the extension on the main wing spars. it's funny, because i'm sure you have to do this because the aluminum stock comes in 12 foot lengths, and it needs to be about 4 inches longer. cleco, drill, deburr, prime and rivet. nothing to it.