I have a 85 force outboard engine at one time had the standard prop cone at the end of the propeller. I thought there was a counter pin holding it in place over the years. Thru time and props, the cone has since been long gone. I was able to find a new old stock from quick silver. It came with the standard screw as well. Everything matches up correctly except the big problem is there is no where for the screw to thread into. It has had a couple Michigan props on it for several years now. Is there something I'm missing such as a different prop nut?