These are a couple of risers I made over the last couple of days. I couldn't find any I liked so designed and made these. A little complex to make these, with multiple procedures. I cut a couple of pieces off a 25 mm thick ally slab to rough size, then I worked out which bits to do first, which were the 22mm hole, then the two 6.5mm holes in the top. After that it was just a matter of chucking the bar clamp end in the four jaw. Once chucked, I turned it down to 40mm and drilled and tapped the bottom with a 10mm x 1.25 thread. Then turned it around and turned the top end down to 55mm and angled the leads in with the compound. Once that was done, I mounted a vertical slide on the cross feed, mounted an arbor with a 2mm slit saw in the chuck and cut the top clamps free. After that, it was just a matter of drilling the top clamp holes out to 8mm, with a 10 mm recess for the allen heads and tapping the lower holes 8mm x 1.25. And then polishing, filthy job. Wife hates it too, tramping black crap all around the place. But they turned out pretty good I think. I was going to make a couple more from some round stock, but these turned out so well, I stopped here.