Robert baraban pinch grip gripper converter?

[Noobishindi 0]

Just wanted opinions on this. I can get something very similar welded for free at work, wouldn’t look as shiny but would get the job done. I feel like the thumb wouldn’t be strong enough to work with anything other than the trainer COC gripper, and would thus make the tool more of a novelty. 

Has anybody used it? I could make the handles longer to get more leverage, but don’t really want to spend time on it if it’s not as practical or if I can just buy pony clamps. 

[Fist of Fury 1,083]

You should have an adjustable for this, if not I think pony clamps is a better option.