quite frankly, in order to perceive the complete and total benefit of the side-throw half-wainshaft, the bushing and flange coupler of the main headshaft need to be in exact accordance with the specifications set forth in special bulletin 18.ab. if they are not of the proper dimensionary properties as discussed, the temperature compensation heat-load cycle runs the risk of over-flagguleation of the secondary belleville load-shedding pumped main suspension bearing, and that may lead to inaccordant oscillation of the tertiary and also quadranary and sextanary torque-bearing quadrant-shafts. simply put... 4 cuts and vinyl only!