yeah, i got a knob problem. any GK 800RB owners out there ever lose the tops to the knobs on yer amp? Not the whole knob itself, just the little part on top that has the white line showing where the fark your setting is?? I've lost about 5 of 'em and now i'm kinda just "playing by ear" and my settings are never the same for each show. I lost 2 of 'em last week alone. Where's our resident GK dude? i need some advice on this if you can sell me the tops or do i need new knobs or what???