Dave Bridgham and I were manoeuvreing to be able to produce clones of the one you loaned me (he has access to a computer-controlled milling machine at his maker-space or whatever the name is for them now, and we bought a good-sized sheet of the required plastic to be able to crank them out) when I came down with COVID early in the pendemic, and in the aftermath (I came down with long-haul post-COVID Chronic Fatigue Syndrome) itgot put on hold. The loaner, and a micrometer to measure it, are still siting on the table in my family room, next to my desktop. If anybody needs some, I can probably try finishing the drawing, and get it to Dave, so we can resume that project. Noel