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This is what Tom says:
When the fuel pump is re-assembled, the directions tell you to operate the rocker arm to it's full travel in order to draw the diaphragm down into the casting. THEN the bolt circle lines up and the screws are tightened to hold the diaphragm down in it's flexed position. This allows the diaphragm to flap up and down moving as the sail on a boat does- not stretching. That gives the diaphragm the longest mechanical life.