The Main Axle is from an S10 Chevy truck. It's tapered shaft makes
it easy to slide out of the bearings, the fork bolts-on just like a tire.
The bearings are surlpus, but have no defects. The fork has 3/16"
aluminum plating bottom and top to prevent Torsional Stress on the internal
cross-box construction. The main Axle Bearing Box has a hole in the
bottom where the Axle protrudes for attachment of an optional Opto-Encoder.
The Legs are attached to the Axle Box by 5/8" Steel Rods which go
through the box; this makes for a very stable Axle mount, and comes apart
by loosening 2 nuts. The rear wheels are swivel mount with lever
locks.