6mm Plywood 16x 16mm M3 screws 16x M3 nuts 1x Swivel ball bearing I've got the ball bearing off ebay. Bought a pretty huge one which is not necessary but nice. http://www.ebay.de/itm/371797651932?_trksid=p2060353.m1438.l2649 Make sure that the inner hole of the ball bearing has a diameter of at least 22mm or else you won't be able to get the power cable through it.