Today I finished all of the prep work on the wing spars except priming and riveting. I used my new countersink to finish countersinking the tie down brackets. I deburred the spars themselves, scotchbrited the remaining parts, and dimpled part of the spar that is hard to dimple after the reinforcement fork is installed. Priming is somewhat time consuming, and I want to do the biggest batches possible to save time. That being the case, I set the parts for the spars aside, and began work on the wing ribs. I’m only going to prime when I absolutely cannot continue work until I do.
On the left you can see my new #40 countersink compared to my #30 countersink. The #40’s that broke were of the same style as the #30 shown here. You can see why its weaker. I’m not sure what the advantage may be to the style on the right, but I prefer the new stronger countersink. It seems less prone to chatter too.