also know these pumps are available with a splined drive input shaft, about half the price of the JD one. So i talked to a machine shop about the pulley being duplicated but with a splined center drive hole, he said its no problem at all for his shop. That i am sure of seen some 16' diameter sheaves that he rebuilt for some bridges, draw style, redid center sections, and sheave channels,weld up, machine back to specs and make new soild bronze/olite buhings that they pressed fit into them. sheaves were about 14 iches thick. bushings were about 8 inches thick from outer cir to inner circunference. can't even imagine how much these things weighed.