For future advice to anyone, just use plenty of heat and the dent won't form. I've pulled my fenders countless times, and hammered them in and pulled them again to fit different setups, my lips aren't even cut, and so far I've never gotten the dent. As long as you use a heat gun or at least a blow dryer and heat up the lip and the area above it well enough, you shouldn't have to worry about getting the dent.
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