As long as the steels slide off the hub freely, and that they are flat, they can be re-used. You must remove the glaze off them before putting them back in. Simply remove the blue / black by bead blasting them, or sanding them on 120 grit on a flat surface. I typically do this to the plates every 100 passes or so, or whenever the 60 ft times start to fall off. I strongly disagree that clutches need to be swapped out as a set. Thats a waste of money, but if you must, please send me your old ones
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. You may also find that many of the fibers are also within thickness specification after 4000 miles. You can clean them off in paint thinner, measure them up and replace only the ones you need. Always make sure you soak your fibers in oil for a least a day before install.