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Remember when installing a store bought or homemade diaphragm to pull on it by levering the pump arm when assembling the pump, then tighten the screws. The purpose is to insure the material has enough flex at all points of travel when pumping.
I'm afraid I didn't explain that so well, it's tough to describe. I hope you get my meaning. The diaphragm shouldn't tighten up before it reaches the limits of travel.
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