I just replaced the water pump with the whole replacement kit.(Everything) even changed the lower unit oil while I was there. Question is: I am now questioning my memory as to weather or not I secured the plastic sleeve that sits down in the cup that the copper water tube sits in. It's there, but I'm not sure now if it's properly seated.What kind of damage can occur if I do not go back in and properly seat the sleeve.??? It's no problem other than doing it all over again. It's still in the driveway and hasn't been test driven as of yet...