RBS stock a full supply of the small parts for a Enderle fuel pump hex drive such as the shim kit for the thrust bearing assm.
Kit includes nine heat treated and ground thrust washers shims to help set the cam end play. Shims are 1.125" O.D., .750" I.D. The racer gets two .005", one .010", two .015", one .020", three .030" shims.