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I have a Rivnut tool but I don't use it much. I use a piece of metal strap with a hole and a starwasher and bolt. Works like this, bend strap with 2 45s to make clearance for your fingers, place rivnut in position with star washer between rivnut and strap, insert bolt and tighten bolt to set rivnut. I've set hundreds this way, slower but faster because it always works. I keep the bolt lubed with 90w gear oil and change bolts frequently.Brian