For very long times of exposure, we can get a “B” position loosing the small spring that closes the crank that sometimes acts as trigger - stopper. So the pinhole of the camera will be open the desired time.
Once the picture has been taken, we must hook the spring in its place of origin, for avoiding that the pinhole keeps open.
The spring can just be loosed in the down part of the camera, as shown in the picture. The hook of the spring in the crank that acts as the trigger is very just for avoiding loses.
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