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Here's a trick for getting the new vacuum secondary diaphragm in place without damaging it. Lightly clamp the diaphragm's shaft in a vise with the bottom half of the housing resting on top of the vise. This leaves both hands free to push the top in place and tighten the screws. Use some silicone spray on the screws and diaphragm corners to keep them from grabbing and tearing.