Rolling fenders for clearance, yes, I used "search" but looking for more... Options

[ottox914]

Need to find 1/4 to 1/2 inch more clearance to the back fenders for a new wheel/tire combo. Would prefer to not destroy the paint, (wouldn't we all) but if I have take a few cracks, well, I have to. I have some rust coming back below the sail plane vinyl that needs fix'n, so there may be paint for the quarters in the picture this winter anyway. Don't want to go to GT flairs just yet, still want stock looking contours and fender line, so the sawzall is not the right tool for the job. Used our friend Mr Search, but didn't find what I was looking for. The car is a '73, so the fender lip or return is already notched out around the top of the arch. I need more than to just fold the return back against the underside of the fender, I need 1/4 to 1/2 inch or so on each side.

Anyone got photos of the technique? I've read about everything from plastic pipe to baseball bats to porta-power. Before and after shots? Been there/done that advise on what works, and what does NOT work?

Oh, and I really suck at body work. Hands of stone and no eye for contours. I like rachets and wrenches, not sanding blocks and paint sprayers.