I need a pulley for a 1/2hp motor with a 14mm shaft with key. Ideally it would be 3 1/4" outside diameter, but anything from 3" to 4" would do. I guess I could cut the keyway myself if necessary. Can anyone suggest a source for this at low cost? I have a few other pulleys which all seem to be slightly different in design but seem to fit the belt I have. From what I've seen there are a few standard pulley types and I'm concerned I might end up using a pulley that seems ok, but causes problems due to it being incompatible. Any information or links to gen me up would be much appreciated.