When I worked for The William L Bon L company back in the 80's we made aftermarket anodized and painted automotive accessories along with thousands of other pieces made from aluminum. We also made the Olympic torch for the Georgia Olympic games. Anyway we made a custom machine with adjustable opposing rollers of all different sizes to "Roll Correct" any imperfections in the extrusions. It was the cat's meow for straight pieces. A person could make a simple hand crank version in their garage to roll the trim and the hammer for the tough spots...especially nice for shops or people who do a lot of their own restorations.