|Dehel medium format camera body|
|Knife blade in insert block|
|Block with blade glued into the camera body|
I realised that the blade tip would be held more securely if it could be located into a corresponding slot cut into the pressure plate after passing through the film and backing paper. As a typical folding camera, the sprung pressure plate is fixed to the camera back; in order to make a cut in the plate with a hacksaw, I removed this entirely. Once cut, I fixed the pressure plate to the body with black tape where it could be folded over the film once loaded (a design that a few cameras do in fact use for their pressure plates) and the springs still attached inside the camera back would continue to provide the pressure to the plate.
|Pressure plate replaced with cut to locate blade tip|
|Test with backing paper in place of film|
|Detail with blade tip just visible through the cut in the pressure plate|