[RRLedford]

Cantilevered upper miter gear shaft might be problematic, even with hardened shaft. Extending shaft support tube down nearer to it might at least help some.

I would attach large gear direct to wheel with stand offs, and moving it as close to wheel as rest of H/W will allow.

Also, bearing of upper horizontal shaft must handle axial thrust of miter gear pair, not sure by PIC if this is adequately handled yet.

-Dick Ledford