Although not reversible, I know a few DIY stand/rack makers that use expanding spray in foam (available at any hardware store) to dampen hollow tubes.
Any Way To Damp Ringing Stands Without Adding Weight???
My 24"Pangea stands ring like a bell when I tap them..I don't want to add weight...I read about unscented kitty litter but with 1000% humidity where I live probably not a good idea since it absorbs moisture...How about spray foam like you use in construction to plug holes?Any other ideas?Thanks much..