OK,I purchased this used prop off ebay and got a good deal ,($26).for a 1988 125 singel exhaust. On the back side of my trashed prop is a washer that covers the rubber, my new prop does not have one. How do you remove this.? AS usual my Seloc manual let me down. I wanted to buy a new one from iboats but, theyonly have 21p for my motor. You high ranking officers sure do a dood job keeping us dummys afloat.THANK YOU.