I remember looking at the subject awhile back but am unable to find it now. I really cant remember if it was here or over at sh.org . I have drilled the rivits out and have pulled the can apart just trying to figure out what needs to be tossed. I am wanting more rumble noise just not the pingy tinny noise. Do I discard the steel wool looking material wrapped around the center pipe or the fiberglass packing itself or both. Thanks for your help in advance....Jay