ORIGINAL: darock
Vibration kills crystals, receivers, servo gears, loosens bolts, screws up on-off switches, messes up connectors, foams fuel, walks out screws, and weakens glue joints.
darock, you left out breaking hinges. radioflyer, I don't think selling a shaker engine to someone who thinks this just means power is screwing them, as long as they know what the're getting.