Alcohol is only mildly effective at fixing dry/hard/slick rubber. A product called 'goof off' will do a decent job of dissolving the hard outer layer (it also attacks plastic so pull the pinch roller out). Automotive belt dressing is a good follow up to the goof off...It will add new stickiness to the rubber. I've used that combo on everything from 40's phono idlers to broadcast Umatic decks with good results (even on some really lousy rubber).
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