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Made from 3mm thick High Carbon British Spring steel and coiled as tight as possible on some custom spring tooling to get maximum strength!  Provides a long lasting, consistent and reliable 8,500rpm on FS Steel Clutch Shoes.


The spring is too thick to fit on fiber CY or Zenoah shoes.  You must use FS clutch shoes

BLACKBONE 8,500rpm 54mm Clutch Spring

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