[jerryhawthorne]

Mike, nothing to loose trying to add a little tension to the "nub" section. It appears the base layer is fine. Think of the springy section as the wiper, touching the resistance section when the nub goes over it and presses down. The springy section is directly attached to the center tap of pot . As it is pressed down with tension from the nub part, it contacts the base resistance material and depending on the rotation of the shaft, it will change the resistance. Perhaps the nub on the bad section has worn down a little.
Jerry