Thanks but I've got a few of those. I'm looking to lose the thickness of the Look adapter.
The compatibility disc is usually required to make shoes with speedplay specific drilling to work with the cleats as they have a slight recess on them, but some shoes had other systems specific to time - I know the sidi genius 2 (the blue and yellow ones used by Indurain) had a special insert.
I suspect my options are DMT with speedplay drilling or Northwave Extreme with the speedplay adapter,bjt that will probably only save half the thickness of the look adapter...