Re: rolling fenders
The Eastwood tool and the ball bat will only roll the lips partially. The only way to roll them flat for max clearance is with a medium sized hammer and some patience.
First thing I would suggest before doing anything is to use a razor blade etc to scribe a line on the edge of the wheel well opening.. This acts as a breaking point for the paint to keep it from peeling/flaking onto the outer panel.
If your quarters have been replaced before and the installer didnt know how to weld and used body filler to hide his work you should plan on re working the lip and refinishing the entire panel.
Jack the rear of the car up and remove the wheels. Moving back and fourth tap the lip until you get a fill for things. If your patient and work back and fourth you will slowely "stretch" the lip and roll it flat against the outer wheel house without distorting the outer surface.
Each time the hammer hits the lip it will stretch it, it takes me approx ten minutes for each side. If done correctly a couple of coats of primer is all thats needed to smooth the lip. Since it cant be seen I just sand, mask the outer panel and seal/paint the lip.
No two cars are exactly alike.. the tollerance/space between the outer wheel house and the quarter skin is different from car to car. Some will have a thick space/gap that makes it harder to roll the lip flat and others have very little space that makes it easy to roll flat for max clearance.
You can also trim approx 1/4 to 3/8" off the lip without affecting the structural strength of the panel. Just be sure not to cut through or remove the spot welds.