First let me say I think the 2 wheel collars on the elevator pushrods work fine. If you feel a little doubtfull just ruff up the rods just before you line everything up and when its just right add a drop of solder between the rods, or slip 1 collar back, add a little 30 minute epoxy put it back in place and then do the same to the other one.

Had a 50 SX on mine and it hauled it around enuff to do large knife edge loops, so it had all the power I needed.

Ed M.