Having dismissed the idea of paying £240 for the matching Schneider focus mount, I have taken apart an old Minolta lens and with a little bit of machining, I should be able to mount this lens in its helical mechanism.
The inner helix is currently with a friend who is going to open it out a bit to accomodate the rear element assembly (I could do it but my lathe doesn't have a motor at the moment). I hope this goes o.k. as it is quite a precision job for him. He's used to much larger work than this as he repairs and restores military tanks for a living!