I have one that I haven't used for years. I went to a trailer for my tinner.
This is one that my BIL made. He made a few to sell as he was going to produce them commercially. His life went in a different direction and he didn't get into production beyond a half dozen units.
This works slick as snot on a door knob and if I hadn't gone to a trailer , I'd still be using it. I don't have a negative thing to say about them.
One day I'll check this one over and put it up for sale. I'll bet if I put power to it, it would work fine.