when you change a impelle do you half to take off the powerhead and if so there is a cover thats on the back of the down shaft that looks like i have to take off to get to one of the screws what is the cover for and should i buy gaskets for that and the powerhead they both have one. im also having trouble taking off the flywheel. any help would be very much apperciated. if this site is to small to list help email me at raowens@yahoo.com thanks