OK...Wish me luck on this brake system.
that axle looks a bit scaryCulverCityClassic
reason I was wondering is on another forum guy built a trike with dual diskbrake in the rear and now he is breaking the axles 5/8s. I am building the same type of trike but with a fully keyed 3/4 axle. Hoping I don't have the axle breaking issues he is. His is pedal only Mine will have a 99cc pred with machined from solid stock diskbrake adapters to go on the 3/4 axle that have full length keys.
this is what I am hoping to avoid brake mounts were held in place by a 1/4 inch bolt driller thru the axle
well yeah its broken....that axle looks a bit scary