I took a break from doing the electrical to perform the Service Letter 00014 Tailcone Stiffener that I had shipped some time ago.
The instructions called for drawing arcs from specific rivets to locate the points of the two end rivets for the stiffener. I used O-rings to modify a compass that I have. It really worked good. I set the distances and drew the arcs as in the instructions. I checked them against the stiffener. The holes were juse a bit off and after re-measuring I found the .88 arc was about 1/16th off. I redrew it and bingo the locations worked!
Unfortunately, after only working on it briefly I had something come up that made it a short work session for the night.....at least I got something done!