Once the main wheels were assembled and the bearings fully packed with grease, I mounted them to the axle and tightened down the end nuts to the right tension. I then drilled starter holes into the axle using reference holes in the end nuts. I then removed the wheel assemblies and drilled the cotter key holes through at the starter hole reference points. With those holes done, I final-mounted the wheel assemblies to the axle, tightened the end nuts, then installed the cotter keys. I finally rebuilt the brakes.
