S&S Cycle Oil Pump Drill Jig 53-0013 The S&S crankcase oil passage drilling jig is used to perform crankcase drilling modifications when installing an S&S oil pump assembly on 70-80 models Made of hardened steel for durability, this fixture enables the builder to perform optionalmodifications on all other models 36 to 91 Big Twin models; H-D#94461-81 36 to 91 Big Twin models; H-D#94461-81