[jerryhawthorne]

Oh my Mike, certainly looks like a single one I had on my Fada that was opening up. I ended up replacing it with a "modern" control. The first picture shows well the workings, not at all like a newer pot. The resistance aspect is layered on the bottom and the wiper with the nub on it moves around over the springy semicircular piece of metal pushing it down to make contact with the resistance substrate under it if that makes sense. I'm not certain what the taper of the pots are but knowing that I'm certain Mark Opat could make you up something that would work. My problem was that the layered resistance material under the springy piece was compromised. No fixing that that I know of. If the second pot that your having trouble with measures good, end to end but jumps around from wiper to end you may have some crud ( technical word) in that area of jumping keeping the pressed down spring from contacting that area. Good end to end measurement seem to indicate that the resistance "plating" is in tact. Perhaps someone can suggest something that won't hurt the resistance coating but may clean that area and the area under the springy material.
Perhaps a tiny adjustment on the wiper with the tip to apply a little more pressure on the flaky one? Could be fun, or not.
Good luck, Jerry