Wheel hub changes

[oogali]

Changes recommended for the wheel hub

1. The gear pulley needs the grub screw hole to move nearer the wheel that way it pinches the foam wheel tighter.
2. The diameter of the shaft of the wheel needs to be increase to press hard against the inside of the foam wheel.
3. Consider creating a spiky pattern that can spike into the foam wheel and hold in place better. Bite foam the better.

Another option is to decrease the foam wheel inner diameter to make the foam wheel hold tighter.