Step 5Jaws
iImage Information

I milled the moving jaw with a small endmill so it took a long time but probably I could have made the small radius corners by drilling them first, or even by making it in three pieces, with a channel and two ends. The ends are radiussed at the bottom, in the front to clear the top of the nut, and in the back so if I ever radius the end of the base it will get another 15mm capacity. I ground the middle of the dowel pin, and honed it flat.
After milling the keyslot on the fixed jaw I fit the key to both parts and pressed them together, marked for the screws and drilled, counterbored and tapped for 1/4"-20 socket head cap screws.