I made myself a sharpening device. It is very simular to the Lindsay thing. I have never seen one eccept in a picture, but I made a prototype. It works very well. I made several out of wood at first and then , I used aluminum and a bolt. Drilled a hole the length of the bolt and put a square brass tubing in the hole, and soldered it in Then I put in a set screw to hold the graver. Then a pin to hold the bolt in position. By flipping it over I can put the heel on also. I need to tune it up a bit. Getting the aluminum tube and the alignment pin both straight and lined up is the trick. I have no intention of selling it and infringing on his patent but I will use the one I made for myself. Having a lot of fun making it. That is what I do. I hate the Crocker thing. I am going to re design that thing too and build one. I have to. Just to see if I can. I love to build and fix things. .