I've never seen it on a #4-5". I have put this together on an "old-style" #8 before. That was cute. Your's looked like a #4-4 1/2" to me because of the handle size. It appeared to be too small of a diameter for the 1/4" stock version. I wish you had shown me that one at the show. I bet it handles extremely well!
Best, Capt. Chris