Thanks for all the suggestions..... I *can* make a homemade wrench, as
suggested by some, but I was hoping to find something which would be
almost a perfect fit down on top of the wingnut, to prevent breaking
off the "ears". The pipe with a slot will probably work, and the
links provided show basically that style plus one looking like a piece
of folded-over metal but still not exactly what I was wanting. I
guess I could get a 3/8" wingnut, and start machining.......
Thanks for the help.
Ken.