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Lentech exclusively utilizes Alto high-performance clutch material throughout the Street Terminator Plus. An Alto eight-clutch PowerPack is used in the direct (3/OD) drum, having hard Kolene steels for better grip and longer life, and smooth discs for greater surface area (factory discs have a waffled surface). In this shot, the piston has already been installed in the direct drum. In operation, the clutch pack is squeezed between the piston and the natural-finish backing plate seen beneath the black Kolene steels. When not engaged, there is about 0.006 inch clearance between each clutch element.