Re: D-nut / Clinch nut
I think the easiest way is to carefully grind off the peened-over lip of the old one, until you can see the outline of the "D" shape, and then just tap them out. Need to be careful to only grind the "D" nut lip, without thinning the sheetmetal. Then the new "D" nut can easily be slipped in and peened over.
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