Thank you sir, I've done basically the same thing you posted there. I've had a few days to think about it, and decided to get some useful tips before attempting it.
I've had the main drive sprocket splines to strip, and while I'm that far into the primary I decided to replace all the seals. I'm not sure the seal in question is even leaking, but with my luck if I don't change it now, it'll leak later.