Where can I get a parts drawing for a 1989 520H wheel horse mower? I need the idler pulley that is for the hydrostat drive, the belt that goes from the motor to the transaxle or whatever its called? The idler pulley crapped the bed this weekend and I cant find any locally. Its about 3 1/4" in dia, with about a 3/8" hole through it. I cant find a drawing to get the toro part number and want to make sure i get the right pulley. Thanks for the help