So a few weeks ago I ordered the internal rudder stop from Flyboys Accessories, and it arrived this week. (Usually, one mounts external stops to the side of the fuselage, but this is an internal version that will help me not damage anything while mounting the rudder to the vertical stabilizer.)

I made the decision to order the one with predrilled holes, but that turns out to be a mistake.

Instead of having a blank stop to clamp in place, mark reasonable locations for holes, then drill both the hinge brackets and the stop together, I had to mark and measure the brackets for the existing holes in the stop (which were not symmetric, by the way).

After a lot of cursing, I finally got some pilot holes drilled, but not in a very straight line. I massaged and finessed (and cursed) the upsizing of the holes to #12 for AN3 bolts, and it worked out in the end.

0.5 hours on a Saturday is a bit low, but at least I got SOMETHING done.