I have just purchased a Technika III. One of the lens boards that came with this camera is recessed about 1/4" and is drilled for a Compur 0 shutter. I tried mo unting an old Linhof Angulon 90 f6.8 lens on this board and when it is mounted, the aperture adjustment lever will not move because it is touching the recessed portion of the lens board. I can start looking for a flat lens board but would l ove to use this recessed board if possible. Any ideas!