Yup. Mine hadn't been tight enough on the big nut I think. There was about a millimetre of float - ouch! - when I got to it, so it was pretty bad, though the shims hadn't disintegrated. One had split though iirc.
So a big 4-pegged monster-weapon was knocked up with an inch 'n a 'arf hex for a 3/4 drive socket to make sure I could do it up tight in future.
Seems to have stayed put since, although I don't make a habit of taking the primary case off to inspect it, I have to admit, because since following the wise advice of Brian down-under from on here to invest in Surflex clutch plates on the 4-springer on there, I haven't had to get the primary side open in years, literally.