Kurt, here's a sneaky trick that might not be obvious to a new machinist. Chuck a drill bit that's about the size of the shaft into a 3-jaw chuck, and clamp and shim the throttle body onto the lathe carriage so it's a slip fit over the drill bit as you move the carriage back and forth. Then substitute the reamer for the drill bit, turn the lathe on, and use the carriage feed to advance the throttle body over the reamer. You'll get line-bored holes that way that are in perfect alignment. Once the bushings are pressed in, use the same setup procedure to ream them to fit the throttle shaft.
Jerry
