I've been working a little here and a little there for the last couple of days. I enlarged all of the holes on the right wing skeleton from #40 pilot holes to their finished #20 size. I still need to do quite a bit of deburring on the skeleton. I've also been working on the bellcrank assembly, which has turned out quite good. I was able to get the tolerances I was looking for by making a 16.5mm spacer out of some aluminum rod I'd gotten to make center spar spacers. I cut the rod to a roughly close size with my miter saw, drilled a 3/16" hole through the middle, then filed it to perfection. Be careful cutting the rod. I encased mine in a little wooden box so that it wouldn't become a projectile if the saw blade caught it. I used a 3/16 drill bit as my alignment pin, and it worked out just right. Later, I cut my 4130 steel tubing to make the bushing with a regular old plumbing pipe cutter, then filed the bushing to the exact size. The whole thing fits together very neatly, and with close tolerances.
Regular plumbing tubing cutter used to cut bushing
