I've just got a new PG1070 Sram force cassette in the post. I've put it on my Shimano R501 wheel (which I just took an Apex cassette off), but there seems to be a bit of back & forth rotational play, maybe a mm or so. It feels as if the freehub teeth/grooves aren't wide enough.
I've never had a problem fitting Sram cassettes before, am I missing something? I know the old OG cassettes had some compatibility issues a few years back.
The freehub was fine (only about 500 miles in it since new) with the old cassette.
Any help IDing the problem would be great.