I'm building a camera with the P41, pelican 1040 case with pixcontrollers camera shelf/board mount. How do you keep the camera in place? I tried drilling a hole in the shelf and bolted it to the camera using the tripod mount but it seems back into the case too far. Now if I use the foam pad it closes it off okay but still seems back too far. I even drilled my camera mount hole as far forward on the shelf as possible. Any ideas? Or is there no problem?