Mike  -

Thanks again for the good words!   Well, I had thought of the interchangeable heads, and others have asked about them, but I really like to focus on the sort of "nut driver" style tool rather than to let it morph into being something more like a socket set or Swiss Army knife that tries to do too many different things.      That, and I'm pretty much at my limit actually making them all from raw materials in my alleged "spare time."

F2