[Mike Martus]

There are certain specifications regarding wheels that need to be followed:

1. They must be off the shelf available to anyone that wants to purchase them.

2. The surface MUST be rubber, plastic or other non metal surface. You cannot have a surface that would damage the carpet and floor.

Screws on the surface - slightly below are not allowed.

Wheels may be purchased from many sources, hardware stores, Lowes, Home Depot, lawnmower shops, catalogs.

Consider durability, cost and how you will mount the drive system - remember no precision machining allowed.