From: ohg...@gmail.com   
      
   On Monday, January 16, 2023 at 6:34:48 PM UTC-5, Cursitor Doom wrote:   
   > Anyone successfully done this? If so, what's the secret? I've been    
   > f***-arsing around for 4 hours today trying to do one on a 1972    
   > Grundig portable FM/AM radio and got nowhere. The design is most of    
   > the problem. For some reason, the drive pully is completely smooth and    
   > affords no grip to the cord whatsoever, so the thing just slips around    
   > such that the pointer only moves when it can get a bit of traction.    
   > What a f***ing joke.   
      
   Friction, friction, friction...  not at the drive pulley where the dial cord   
   grabs but everywhere else.   
      
   You must eliminate all possible friction from everywhere in the tuning   
   system.  Make sure the tuner's bearings are free of hardened gunk and lubed.    
   When disconnected, the tuner should only require a very light touch to   
   rotate.     
      
   See those little pulley's that handle the string?  They absorb all the   
   string's efforts if they're dragging (and get worse with string tension on   
   them).  If you can remove them, clean and polish the shafts and apply some   
   graphite.   If you can't remove    
   them (some are staked on), then run some non aggressive solvent into the shaft   
   and spin by hand until the move with no effort.  With a small jeweler's   
   screwdriver, add some graphite to the hub and tap so the graphite gets inside   
   the pulley.  Don't "poof"    
   the graphite in as it will probably get on the pulley's surface and transfer   
   it to the string where it might make it back to the drive pulley shaft.   
      
   A lot of guys miss the dial indicator.. they're usually just folded metal that   
   slide along the metal dial scale.  Those things drag like you won't believe.   
   Sometimes the dial might have a piece of folded fish paper inside as a   
   bearing, but many don't.     
   In any case, clean and polish the edge of the dial with an abrasive if need be   
   to form a highly polished bearing surface.  Rub some graphite into the area   
   right where the dial slides along.  Careful not to get graphite on the dial   
   itself (unsightly).   
      
   Before restringing, get a Q-Tip/ISO and clean the drive pulley shaft and all   
   secondary pulleys of lube or wayward graphite. If you excise all possible   
   friction, you'll find it will tune with no dragging, jerking, or stopping even   
   with less turns around    
   the drive pulley than the diagram calls for (resist the temptation of adding   
   more turns than it calls for - it only causes windup binding).   
      
   I've had people pooh-pooh this advice and end up giving me the radio to   
   restring because they don't believe that tiny amount of friction will prevent   
   the dial cord from grabbing.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)