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I received the new tap today, but unfortunately it is a slightly different size to the one I have, the new tap is physically slightly smaller, and its thread outside diameter slightly larger at 9.7mm (old is 9.55mm) and the thread seems slightly finer on the new one, so I guess mine is none standard. The tap on mine fits into a small adapter (which the new tap won’t screw in to) which in turn fits into a slightly larger hole on the cylinder block, the diameter of the thread of the adapter that fits into the block is 10.85mm but I have no idea what type of thread it is, or that of the original tap, any ideas ?