i was thinking RAS or Drovak did the bushing thing. basically they put a .875 o.d.- .75 i.d. bronze bushing in the rocker and use a .750" shaft with some spacers to go between the shafts and shaft stands. being a machinist it wouldn't be difficult for you to fab your own set up. the only issue i see is choice of shaft material for strength and being compatible with the bronze.