Lock washers are used for keeping nuts and bolts coming loose. They come in various types including self-locking and shakeproof. Each lock washer is made for a specific application.
Jan 29, 2015 · Sorbothane is the trade name for an elastomer, similar to Moon Gel but tougher, commonly used in shock and vibration-dampening situations including in recording studios. These should work pretty well. Downside is cost; we're talking about $30 for a set of 4 pads, and you'll need a pad for each foot and two for each pedal.