During last nights' gig, one of the speakers in my Avatar B212 started rattling/farting so loudly that I thought it was in the process of dying. After further investigation, I determined that the speaker was working properly but the cardboard sealing gasket over the surround was starting to break loose and vibrate against the grill. I removed the grill this afternoon and pounded out a few low,LOUD notes while holding the gasket in place with one hand. Everything sounded good as long as I kept pressure on the gasket. My concern now is should I avoid any particular glue types that could possibly damage the rubberized surround when I attempt to repair the gasket. Any reccomdations? Anyone else ever had this or a similar problem?