I saw a lady using this windlass on the Curdworth locks and she kindly let me photograph it. She said her husband bought it off ebay although it looks like a one off. Obviously it’s an adapted socket set ratchet, but I’ve never seen anything else like it. I omitted to photograph the handle, but it was a pretty standard cranked windlass handle. It was quite light to carry, unlike the big ratchet jobs with extending handles that some chandleries sell. I wouldn’t mind one. Anyone else seen one or know where they come from?