Remove top. Pull on seal with pliers, from top to loosen, spring will come away. At front locate steel circle clip and pull away with pliers.
Replacing seal I found very tricky so here is the way I did it.
Locate new seal, folded in on itself, onto drum. Suspend spring with strong string from top of machine, use a piece of wood across to act as bar. Make four notched tools about 12in long each 1/2in to 1in diameter.
Remove back panel and lay machine on its back. This allows greater access to the seal position. Four hands, two persons for this job, can now locate spring using notched tools to spread the spring at 90 angles, and push down until it clicks into the groove on the drum part groove of the seal. When in place cut the string and remove. Right way up and replace front spring, which is a lot easier than the back one. Have Fun
Rgds
Mike
Michael Denton, March 2008