Tom,
The aluminum rod has a 1/4-20 set screw in the center of the rod.
there is a slot for the yoke that goes past the center of the rod
The set screw pushes the yoke against the far side of the slot.
If you want, I can make one fo you and mail it to you.
The whole setup allows you to use one hand to hold the parts and one hand to press the handle down.
This really allows you to put your weight (I have a lot of that) into the operation. Squeezing the two handles is a very akward motion for me.
joe