Ah yes, the infamous "Duraplug". Most usually found with a slot rudely butchered into the tubular part of the cover by a hapless technician who discovered only after he's wired the plug up that he's not threaded the cover onto the cable.
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Originally Posted by kalee20
Yes I'm surprised too that the answer is elusive.
It was by no means universal - I recall in the 1960's rubber plugs existed with covers which you had to thread onto the cable before connecting the wires to the pins. Such plugs had no little slot hole alongside the earth pin.
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