[MENTION=86278]sadiejane[/MENTION]
I don't believe there is a circlip on that setup, it's threaded anticlockwise, also you may want to do a bit of research on your drive shaft as those types of setups came out with a rubber coating on the shafts which corrode and the coating falls to bits. I've just gone through the same issue last year.
Look up the 2009 - 10 seadoo supplement, I've posted a few pics from the shop manual showing the difference and a bit of insight between the 2 types.