I need to clean the volume control on my Altec Lansing VS2221 which sounds awful with static. I've successfully cleaned others in the past to restore proper operation.

The problem I have with this speaker enclosure is that, after removing the two screws on the back, the panel only comes off about 1.5 inches, then it's like something is holding the rest of the panel from coming off, like glue or tabs. The sides appear to have no give to free up any tabs! If I force the back some more, I'm almost certain it will break! Is there some trick to remove the back of the enclosure so I can get at the volume control to clean it?

TIA

quickcurrent