This turned out to be a casting defect as the handle broke cleanly with no pressure, probably a few ounces. I don't know if this was a one off issue or not as the seller promised a replacement but never delivered. I have requested a refund from Revain. The large cups seemed to have enough grip on the smooth surface. I doubt this is very useful for anything other than a large, shallow dent as each crease breaks the suction. If you have a really smooth dent they can help you, but for me it was a waste of time.
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