I have just changed the rear cassette on my 2020 turbo levo comp and noticed the cassette wobbles slightly. It appears that the free hub body rattles slightly against the hollow shaft that passes through the whole hub. I can't work out how to remove the free hub body. I have taken off the cassette an undone the little boss (with spanner flats on) that covers the first bearing. How do you get the actual free hub body off?