The "vibration resistance" is only to give the Hardly riders confidence that the bulb won't shatter as soon as they crank their "hogs" up. 
04 Speedy, 904cc 12:1 CR JE pistons, ProCom CDI, Nology coils, Hotwires, lightened flywheel, CR ll's, 18 tooth front sprocket, freak kit, cocktail shaker and scypter exhaust, bobbed rear fender, headwinds headlight, wires in bars, and Scott Oiler
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