Bill Cheek writes in a message to Randy Millis
 BC> Squirt a shot of TV tuner cleaner into the openings of those 
 BC> controls and rotate them a few times. Then squirt a shot of 
 BC> WD-40 into each. 
The TV tuner cleaner should include a silicone based lubricant.  I wouldn't 
use WD-40 on anything like that.  It oxidizes, turns brown and very thick 
after a period of time.  The silicone based lubricant is much more stable - 
that's why it's in there.
 
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