From: jerry@example.invalid   
      
   Cursitor Doom  wrote:   
   > Hi all,   
   >   
   > I've got this old Grundig radio made in 1972 and the main tuning cap   
   > gets scratchy from time to time owing to a design defect where they've   
   > put the moving contact at 90 degrees to the shaft so it runs in a   
   > narrow slot, rather than the more common leaf spring contact. Over   
   > time, this has worn and as it has, it doesn't self-correct for tension   
   > like the leaf type does. So I've been using a switch cleaning   
   > lubricant on it, which works great for about 6 weeks, but then it's   
   > getting scratchy again. Is there something more permanent I can use to   
   > maintain good contact? I'm thinking maybe copper grease like the stuff   
   > they use on brake pads to stop squealing. Would that work? Switch   
   > lubricant fluid is just not sludgy enough to stick around!   
   >   
   > CD.   
      
   Powdered graphite used for locks perhaps?   
      
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