Originally Posted by
Rael
I removed the end with the screw. I was worried about the one way valve as well, but on this particular bulb, it requires quite a vigorous pump to engage, so it works out great. When I have the instantaneous shutter pin in, I can just mash the bulb to get 1/25th, or I can put my thumb over the end, squeeze lightly to open the shutter, and release my thumb, and the shutter will stay open. To close it, I squeeze the bulb softly, (which doesn't activate the one way valve) air comes out through the one way valve, I put my thumb over it again and the bulb suction closes it. I have an amazing amount of control over it.
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