You also need to make a jig, sort of like a lathe without power to mount the tubes on. Mine was a 12" piece of 2x8 with uprights on both ends out of 8 inch 2x4's. In both 2x4's at about 7" high I drilled and tapped for 3/8" all thread. I made plugs out of Delrin that fit the tubes, these screwed on to the all thread and when screwed in the wood, they held the tubes in place. Sorry I found no pics.