I'd like to make my own chuck......I've got a cnc machine that would cut the arcs with no problem. I've also got a lot of 1/2" corian that would work well with the chuck. What escapes me is how the bolts ride in the lower piece of the chuck. Are the arcs cut into the lower piece wider than the top so as to accomodate the bolt head? Are the two pieces attached to one another somehow? Couple pics would sure be nice.