Straightening an aluminum arrow requires that the arrow be bent slightly past straight in the direction opposite the bend, same as straightening wood by hand. The Ace Roller is a wheel on an axle that rolls along the shaft, as mentioned above, to compress wood fibers. I suppose you could roll it along aluminum, not for compression, but to apply pressure not compression. I think it would be cumbersome. Much easier to roll on a table, bend by hand and roll again. Repeat until straight. Also, bends near the end of the shaft, IMO, are not straightenable.