For the MSX 140 crankshaft replacement you must use the provided c-clip to hold the crank in place when using an SBT crankshaft. (see A) Rear seals will prevent crank from moving backwards. Remanufactured Crankshaft, including all new main and wrist-pin bearings, inner seals and rods. Trued & welded to better than OEM specifications. This product is sold on an exchange basis. Does not qualify for free shipping Please call SBT for Shipping Rate