We made two of the caddys that '66 described, except we used a lazy susan type ball bearing race between two layers of 1/2" plywood. The 3 lb coffee can holds staples, and the wire pulls off easily. We also built one with a 18" nipple out of 1" GRC in place of the coffee can for 1000 ft spools of NM. Use a pipe mount standard to screw the nipple to the plywood base. Makes it easier to transport and store.
