Recently bought a prop from Ebay with the exact model and serial number of my old one (Mercury Tempest Plus 48-825866 25P) Went to replace and noticed that the two props are different. The newer one has an outside collar where the aft adapter is inserted and the old one does not. Also the older hub has a brass adapter where the aft adapter in inserted along with the plastic drive sleeve. Wanted to take out the old hub and put in new one but cannot because of the differences. Has anyone experienced this issue?