It can also paralyze the camera in case of lens and camera jamming, which can lead to missed shots.Just use the small end of Camera Key to engage the shutter-winding screw on the inside of your Hasselblad body and re-cock the shutter. The large end of the CameraKey is used to re-cock a shutter that's been released when the lens is off the body. absolutely a must-have gadget in every Hasselblad owner's bag. When a jamming problem arises, simply use the small end of CameraKey to engage the shutter-winding screw on the inside of your Hasselblad body and re-cock the shutter. The large end of the CameraKey is used to re-cock a shutter that's been released when the lens is off the body.