I'd try a side of beef wrapped in butcher's paper. Fleshes out all the inner detail you can handle. In a month's time you'll have a kinetic audio sculpture, and the movement of the maggots will act to stabilize those nasty vibrations even further still. The magic "indicator-bone" lets you know it's time to replace it with another. If you can't spring for a good side of beef then my second choice would be some rolled up sod from the garden-supply store. I don't recommend pulling another bolt off the Golden Gate Bridge as my green buddy, The Gumbilator, suggests. I got mine pre Patriot-Act. You get caught wrenchin' out one of those puppies these days and your family will be relocated to Downtown, Buttfukt while they erase all their memories of you with a Dremel Tool. Believe me, premature ejaculation, hair loss and your consumer credit rating will cease to be your primary concerns, Keemosabee! Now if you're talking Brooklyn Bridge, well now, I can part with a little piece of that given the right price!
Marco
Marco