[wwest]

Karl, there is cotton wadding surrounding the motor shaft bushings, sleeve bearings, good idea is to (RE-)SOAK that wadding with oil while you're inn there.

For best efficiency when you reinstall the blower wheel on the motor shaft you want the edge of the blower wheel as close to the intake opening as possible, not forgetting the motor shaft end play. You could add a extra thrust bearing/washer if the end play seems to high.