OK got the hold down clamping block done....no picture as it's the same as the one in the picture above. I'm working on the arm.
The design is a cotter design, and I originally did a .38 radius groove, but I don't have a ball turner that will do that and I don't want to make a form tool for 1 cut
So I'll simplify that design just a skosh....and make it trapazoidal....it'll work the same way, but be easier to machine.
Dave