I got the three good aileron brackets riveted to the rear spars without too many problems, although it did take some creative gymnastics to get the squeezer onto all the rivets. If you use the longeron yoke and a 4" no-hole yoke you can get all these rivets set without resorting to the bucking bar – as long as you're not picky about which side the shop head ends up on, since on some of the rivets, the squeezer can only be positioned one way.
Again notice the mix of flush and universal rivets, as called out by the plans:
Then I trimmed, deburred, and clecoed the flap braces in place. I still haven't quite figured out the strategy for attaching the flaps (i.e. what gets machine countersunk and what gets dimpled) so I'll just leave these guys clecoed in place until I get to that stage.
Then I started building the aileron pushrods. The long ones that connect the control sticks to the aileron bellcranks are made of 1.25" aluminum tubing, and the short ones that connect the bellcranks to the ailerons are made of small-diameter 4130 steel tube. My cheap cutoff saw came in handy to cut the tubes to the correct length:
After cleaning up the ends of the cut tubes, I sprayed copious amounts of aerosol primer down the insides until I could see that the innards were evenly coated. Then I also proceeded to prime the exterior surface of the aluminum pushrods – the steel ones are already powder-coated and don't need any further corrosion protection.
Here I've inserted the end cap thingies into the big pushrods and marked the locations for the rivets that hold them on. I'll wait until tomorrow to drill the holes, though, so the primer has a chance to fully cure (so I don't ding them up while working with them).
The plans also call for you to rivet end caps onto the steel pushrods as well, but they give you the option of welding them on too. I may try to find somebody to weld them up for me, since it seems like a welded pushrod end would have a smaller overall size, and thus require less enlargement of the exit hole in the rear spar.