[Tom Line]

We have used the same method for our "dead axles" on a couple bots.

We have an inner and outer rail and simply use a shoulder bolt as the axle. 1/16 plastic tubing keeps the wheels centered between the rails.

One tool and a couple turns and the axle can be removed and the wheel drops out.

It's simple and it's worked well for us, and best of all it requires a minimum of machining since all of our machine work is off site and donated.