From another board, someone asked the same question. They were soundly discouraged as the accuracy will not be good enough unless you have someone machine you the parts as in the directions from lapidary journal and that will probably be expensive too. Now if you want to make a cab machine or flat lap, those look pretty easy from directions i have seen online. The difference comes from the amount of accuracy needed for cutting tiny facets on a small gemstone, versus cabbing a stone that is flat on one side and curved to whatever degree you want on the other. Try looking for a used machine.