I've used the Graham 2.0 with Mk III, IV, & V, and currently use the Graham Phantom III Supreme with my mk VI v.2. Both arms have worked extremely well with all my Dephii. I did have to use the stronger spring when I installed the Phantom.
I think Bob Graham original designed his first arms using a Delphi, but I could be misremembering that.
I think Bob Graham original designed his first arms using a Delphi, but I could be misremembering that.