[RRLedford]

Mount gears or sprockets with non-split hubs directly onto wheels.
Keep gear/sprocket as close to wheel as possible.
Run four long screws all the way through the entire stack - wheel, hub, and gear/sprocket.
Use flat or button head 6-32 screws where close spacing is needed , and countersink for heads as needed
Then drive wheels directly, with axles merely free spinning in the sleeve bearings. No torque applied to axles.

Tetrix axles bend easily and driving wheels via torque applied to Tetrix axles is a very unreliable concept.

-Dick Ledford