There is corrosion since the rubber cap had perished and fallen off a long while ago. The connector was more U shaped than O shaped, so was a bit loose which caused the light to flicker occasionally.
I wonder if the right connector was fitted originally because the replacement was more round and fitted nicely.
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Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers!
S4 Fogarty, S4R 07T, 748, Series 1 Mirage