necifix

Hi, I recently bought a Klipsch ProMedia Ultra 5.1 set from a friend. I'm currently installing a cooling kit in it to prevent overheating (hit some snags but good so far). However, before I started the procedure, I hooked the speakers up as they were to test to see if everything worked. Everything worked fine, however, the control pod was a bit off. Every time I tried to use the dial to change the volume, it would barely if at all go up. I had to push it in a bit and it would make a small grating or scraping sound as I turned it and this time it definitely changed, but, it would jump back and forth, I.E. it would go from volume 22 to 21 to 20 to 19 then up to 26 then down to 24 then up to 28. It would jump up and down as I changed it, it did this in both directions. How can I remedy this? Do I need to replace the DIN plug or is there a way to take it apart and lubricate the plug or something like I've read before? Thanks, Necifix