Step 3: Construct the jaws
The rectangular tube section is the cross piece that everything will mount from.
I drilled and tapped the end of the handle to allow for an M12 stud to hold the pieces together and tack welded the pivot in place.
A slot was milled into the rectangular tube and a hole drilled in the back.
A trial assembly is shown In the 4th picture which also shows the pivots for the bottom of the lever socket.