Not the swapping it out, which was not difficult, simply hard to get at stuff. I pull out the old one, which was cracked, and I see it's cracked because there's a piece of rusted old metal tube in there. And it appears that the tubing runs slightly *up* from the neck to the top of the reservoir. So it pools where the metal tube is.

Some things on the 928, while odd, at least make some kind of sense. Am I missing the non-obvious reason for this setup?