There should be very little space between the nut in front of the prop and the bearing carrier at the end of the shaft housing. Mr. Warren showed me how to set the spacing by using one of the flat washers behind the prop nut as a spacer when installing your prop. The space should only be about 1/16 of an inch.
Grass will build up on the skeg of my 23 while running. Just pump the steering handle up and down several times and it will blow right off.
Hope this helps.