Those cheap fenders are usually so flimsy, I just bend it in with my fingers. But if you want it to look nicer, cut a block of wood out of another block of wood. Put the smaller block on the outside, the larger piece on the inside. Put it all in a vice and squeeze it. The wood removed by the saw will be a little more than the thickness of the metal, and should let it all go into shape. Effectively, put the wood block back together while the metal is inside. If that makes sense... sorry I don't have a pic or diagram.
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