The tuners are sealed units. There isn't much you can do to service them not that there's generally much can go wrong with them either but after 20+ yrs who knows?
In any event the screw on the key shouldn't move at all in relation to the key unless it's come loose or something inside doesn't want to budge.
Tighten it up & see what happens is all I can suggest, may be part of the problem.
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