Graeme, this applies to all the A.C. mechanical pumps. It leaves enough material inside the housing to be able to work up and down. If the screws are tightened with the diaphragm in the neutral position the diaphragm will be tight like a drum skin and not able to deliver a required volume of fuel.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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