Converted to EF mount 2011-Apr-16 without aperture control,
Mamiya ZE-X is totally broken, there is no way to control F-stop.

The conversion was easy, take out the original mount and a little filed down
the aperture ring, which was no use any more, and glued to Leica-R->EF adapter.
The infinity focus is a bit IFFY, aperture control is not possible by the ring.
But you are still able to get approximate F-stop position, not exactly thou.