you can get arch rolling kits, ask around in your local bodyshops. depending on the size of the wheel using depends how far you wana go, you may have to get the quarter painted if your going for a big flare. or you can jack it up stick a broom handle in the arch lower the car down and roll it back and forth
thats what the jap video shows. he tried the pipe first and then did the mallet method, so i assume it dont do anything really.i tries a scaffpole and about 1/2 a ton of extra weight in the back and it did sweet F/A really