From: cd@notformail.com   
      
   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.   
      
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