At a low price like this, for such a high quality component, it really is not worth trying to rejuvenate the original!
Other similar items you may wish to consider:
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Re5 Re5m Re5a 1975 1976 (m) (a) Usa (e03) / 497cc Rotary forum
posts from the Suzuki RE5 RE5M RE5A 1975 1976 (M) (A) USA (E03) / 497CC ROTARY forum