yesir! that sleeve will come out and then put some lithium greese inside the seal before or after you have installed it. whatever you think is easier. and when i install the sleeve i usually put a small ammt of yamahabond on the inside of it so it will make a good seal. it is supposed to be a machined matting surface but i have found that sometimes it leaks. glad it wasnt the case!! seals are easier
take the sleeve out. install the seal like you said then put the sleeve inside after not together