Gordon, maybe you can drive yours over to my place...it sure would be nice to test drive one first.
BTW, I didn't mean to sound as though I was looking to one-off or knock-off Keenan's design. I was using "stavemaster" like people use "zip-loc" when referring to a plastic bag. I thought it was more of a trade name than a trademark name. Anyway, what I had pictured in my mind was a wooden construction shave horse (didn't know it by that name when I posted), rather than what Keenan has constructed, which looks more like a stair master.

No doubt it works beautifully. Much better than my bench vice. Would seriously like to test drive one.