I seem to have a couple of dud EOS t rings

They click into place ok, but there is still a bit of rotational play and a bit rattly. At first I thought I have a due T ring so I got a different one, same thing. I even tried my old Nikon T ring (tight fitting, no play) mated to a Nikon/EOS adapter, same thing

Can anyone recommend a tight fitting EOS T ring, or are they all a bit rattly?
Thanks
Bo