I just sprayed some PB on a clean rag, and then wipe the diaphragms with it. Just enough to cover them, but not be wet.
Did you remove the pump arm pivot rod? The pump arm on my pump is like a two-prong fork. So once the fuel and vacuum sections are together, the the pump arm is inserted so the two prongs engage around the shaft in the opening. Then the pump arm pivot rod is put back in and the retainer plug added.
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