Looks interesting. Nice design, but I think i could lathe cut one from aluminium round bar, drill and tap the center to 1/4x20, and use a flathead elevator bolt for a couple of bucks in material, and a half hour in time.
I'm not saying that it isn't worth $50.00 as a finished shipped product. I'm saying I could fabricate something very close, rather easily. (With access to a lathe)
Good luck with this project sir. I hope you do well with it.
Looking at it that way, if it took a half hour of my time just to make one, $50/per seems about right, once you factor in everything else that goes into it. Setting up your shop, ordering materials, communicating with customers, taking orders, shipping, and other stuff I left out.
