I found part mf 8193768 in tub. I ordered new one from AppliancePartsPros.com . My problem is I don’t know where it goes, the diagram isn;t much help.
You can find the complete instructions in one of my previous posts: http://forum.appliancepartspros.com/dishwasher-repair/5309-whirlpool-spinner-fell-off.html
Gene.