eSN also includes TurboTight 12mm retrofit kit, derived from NAMI 12mm 50mm shafts. Retrofitting is highly recommended as there are inherent design flaws with 14mm shafts and is excessive "play" with the upper section's 8mm RM shaft (and limitations of 8mm shafts). To retrofit, bore the holes in the upper casting to 12mm (or 14mm with supplied SF-1 flanged bearings).
Notes:


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