They can be straightened flat but it's not simple, but a guy who's good with a straightening press can fix 'em. I bought my spiroloks, washers, and wavy spring washers to replace the stock buttons from Performance Machine years ago.
I've straightened a disc after having the same thing done, it's very rare the rotor bends unless it's severe, it's usually the carrier pushing the rotor out of line.
I kept the wheel in the forks and clamped a bit of welding wire to the fork spindle clamp bolt and set it to skim the carrier as close to the bobbins as I could, then using a round bar through the spokes of the carrier carefully tweeked it into line with the welding wire indicator.
I've also had billet carriers made for my marchesini's to suit the different offsets etc and bought new bobbins from Paul Mercer of PFM Engineering Limited (01624 829419)
I'm sure they are goodridge, they are at a mates at the moment.
I like fiche mans idea of straighening the carrier, sound straight forward engineering. If all else fails I will explore new carriers but I would imagine new rotors may be as cheap
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