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I've never heard of that use for a Woods Powr Grip, must be for one of their smaller units. I'd think a hand operated cup used for glass might do it, you have to have a perfect seal, they're meant to work on a flat, smooth surface. I had some great success with those Powr Grip units, setting large pieces of glass requiring 6 people to handle, set with a crane, they make an excellent product, and the model we used was over $5000. They'll custom build you one for your needs, I almost bought a real big custom one for unique high rise job, but decided it would not be safe and rigged the picks differently with slings, which turned out to be equally as dangerous. I am also curious about this other application for dents, the ones I've used have a port with a screen inside the cup, and the cup is flat, there is a guage on it that reads for vacuum, and an alarm that goes off if it starts to lose vacuum, rechargeable battery packs that operate it. Must be a small hand operated type, that you pump by hand, they are handy to have though, we used these to set windows, glass and anything you needed to get a handle on.
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