Replacing plastic chopper sleeve on Maytag Dishwasher

I need to replace the plastic chopper sleeve that screws onto the motor shaft on my Maytag Dishwasher. How do I keep the motor shaft from turning while screwing on the sleeve? Is there a locking hole located somewhere on the motor for this model to stop the shaft from turning?
Thanks for your help.

This should help
16021814 Maytag Jetclean II Dishwashers Service Manual - ApplianceDigest.com

See page 5-34