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 Mandrel Kit, which is made specifically for use   with Allstar ALL31030 Crank Pulley, prevents mandrel bolt breakage. Mandrel is   attached to the crankshaft pulley with three stock length bolts while the   vibration damper is retained with the stock bolt. The mandrel bolt is then   connected to the mandrel - not to the crankshaft - to reduce the possibility of   engine harmonics loosening or actually breaking it. Kit includes all necessary   spacers, pulley guides, and bolts to work effectively with most Crank Mandrel Kit
 
 
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