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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Gsx550es 1987 (h) (e02 E04 E21 E22 E25) forum
posts from the Suzuki GSX550ES 1987 (H) (E02 E04 E21 E22 E25) forum