So I decided to change out my impeler on my 94 force 120 and when i removed the lower unit and I was dropping it down the seal that is above the long shaft came down as well. After having such a hard time to put it back up there because of the space, my neighbor told me that the seal should of have been covered by some sort of plastic cover. It's that correct? I own the boat for years now and I changed the impeler before and I always had to put the seal back up there because it always fell. Please help.