[rfeenstra]

I had a similar problem with my 96.  Found a little heavier string (still not as heavy as the original) but haven't installed it yet.  There was someone here who found some heavy kevlar fishing line.  Don't know if it solved his problem.  It looks to me like the drive pulley is wedge shaped and needs the thicker string to wedge down in to increase friction.  I was having problems with  weight of the capacitor plates not being balanced  at one end of the dial and the lack of friction causing the dial to move on its own and an inability to tune because of the drive pulley issue.