So back into it, I'm getting sick of having a tray blocking my work bench and not in my truck

Enter "the stump grinder"


Ground the clamping edge down to give a nice crisp bend rather than a roll over the curved edge. May need to knock it down another mm but will see how it goes.

Then cut some clearance for the hinges, and added some flat so I could run some bolts through the whole lot to clamp down.
Have slotted the holes so I can adjust the top clamping part to the thickness of the best being bent. I will pull the springs out of the grinder jig and use them in here too.
Bolts will go in the other way around- through my work bench so I can tighten down the nuts to clamp