Having dis-assembled the previously rivetted rudder skeleton, it is now time to rivet it all back together again - this time in the correct order... Despite being very clear now what needed to be done, and which rivet sizes to use where, I still took it slooooowly to avoid any further daft errors, and it's come out nicely. The rudder skins even fit to the spar properly now - who'd've thought?
After that, it was time to install the rudder counter weight - just over 800g of lead - which sits in the upper rudder horn and prevents flutter as well as aiding controllability in yaw. The dimples in the rib sit nicely in the machine countersunk holes in the lead weight, and the whole lot is attached with two AN509-10R16 screws and locknuts, torqued to 25 in-lbs and finsihed with torque seal. (Despite the area eventually being permanently closed off between two rivetted ribs, meaning that inspecting the torque seal will be nigh on impossible.)
Reinforcing plate no longer visible - which means it's now on the CORRECT side of the spar.
