I have just acquired this as part of a MPP Mk VII package, the camera, the 150 lens and a 90mm f6.8 Angulon both on MPP boards. It was bought from someone unfamiliar with photography and had I looked closely at the ebay pictures I should have noticed this. The cable block is fixed to the board rather than the shutter and there is a hole in the shutter where I assume a block once sat. The block is loose and just revolves round and round when pushed. What I am wondering is whether this is a normal and acceptable system or whether I should be returning it. The Angulon has a block fixed to the shutter and seems normal.