
I have a mid 80's Evinrude that had a water pump failure. When I went ti remove the Impeller from the I had a heck o f a time due to some corrosion on the Drive Shaft. Once i managed to slid it up (after cutting of the rubber) by prying in up the Drive Shaft a sliver of white plastic (lying in front of the shaft in the picture) fell off of the flat on the Drive Shaft (a bit hard to see but just visible in the photo).

I was expecting a key similar to the parts list I'm holding in the photo background.
Has anyone seen this before? What is the fix?
Thx