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Incidentally, there are three different versions of the swashplate oil pump, one with a very heavy bronze manifold on the back, and then one with a magnesium manifold, presumably intended for the racing fraternity, and then the one with the much bigger diameter built-in crankcase door, intended only for the pukka Grand Prix engines. The trouble with magnesium is that it can suffer from intense corrosion once the passivated outer skin gets damaged. That is why magnesium crankcases, like on the AJS 7R and Matchless G50 racers, have a gold-coloured coating for protection.