Larry,

It shouldn't really be much of a problem. Just take it slow and don't force anything. I was a tech for 10 years. If the pot isn't sealed try a little WD40 in it. Spray it and work it back and forth. If it is sealed bend the little tabs back a little to create a crack in which you can get a little WD40 in there. Squeeze the tabs back and it should be good to go. If you need to replace the pot go to Radio Shaft get some solder wick to unsolder it. Get the right resistance pot and solder the new one in. I doubt you will need to replace it. Good luck.

Tom