1969 Dodge Dart GT “driver” build

before i bought a cheap arch roller tool i used to get a baseball bat and hold it between arch and tyre while a mate pushed the car back and forward. the bat rolls round the arch and flattens the lip while very slightly pushing the whole panel out if the gap's real small. not much as the tyre will deflect some too. similar principal to the proper tool but more 'redneck', lol.
edit, i used the tool on my 68 valiant and fit 295 tyres under the body with stock spring location and no mini tubs.