Set+Screw+Axel+Hub

**Part Description**
The axel hub fits around the axel of the DC motor and locks into place with the screw on the side. A the motor axel moves so does the hub.

**Interfaces**

 * The hub can attach to gears or wheels with screws and nuts as well as the motor axel.

**Possible uses**

 * It is used for direct drive when a wheel needs to be directly attached to the motor shaft
 * used in indirect drive if a gear needs to be attached to the motor shaft.
 * etc.