Anyone with a bandsaw and a drill press and 18 inches of square 6061 bar stock can make these. There are quite a few members here on the forum that have made theirs with one member even using steel. I've got all the machinery to do it, but at $50 for a kit it's not worth my time to make. If you decide to DIY, don't sell them or you might violate the patent Buchanan may have secured on a block of aluminum with a hole in it.