From: Jeff@invalid.invalid   
      
   On 12/10/2025 23:13, Cursitor Doom wrote:   
   > On Sun, 12 Oct 2025 18:38:50 -0000 (UTC), Jerry Peters   
   >  wrote:   
   >   
   >> 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?   
   >   
   > Powder? Not so much. But they do make a graphite grease and I plan to   
   > try that if the other ideas fail.   
      
   Limiting the spread of a very fine conductive powder might be easier   
   said than done!   
      
   Apart from graphite grease, have you considered a molybdenum sulfide   
   based grease? It's also conductive, and MoS2 has similar properties to   
   graphite as a lubricant. However, according to   
   ,   
   "Conductivity issues can arise from the use of moly grease in electrical   
   connections."   
      
   --   
   Jeff   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)