Pitbull type clamps that can disappear below fixture surface?

[Garwood]

I'm devising a single fixture to make a bunch of similar aluminum plate parts I've made for many years.

It would be super great if there was a pitbull style clamp that would easily drop below the fixture surface for the second op.

Anything like that exist?

 

[Garwood]

Nevermind. I just realized I can make a much simpler fixture offsetting the first and second ops.