Well I've inherited an old tapping head. It's been rusting away in my neighbors garage - I changed the battery in her car and asked her if she would part with it. She had no idea what it was and her husband passed a while back - she was happy to give it to me. I have no idea what I now own or if it even works. Here are some pictures. It looks like the husband welded the shaft at some point. Where can I find a manual - I'll google later.. pictures coming up.