Thanks Nige F for your prompt response. Unfortunately the website address you gave seems inaccessible. I've tried all reasonable permutations of the address, but no joy.
I have the impression that a Delta Tap may be a commercial brand rather than a technical term. Is this so?
David707
I seem to remember the brand name but a further google turned up U.S. sites ........got a feeling the washers could`ve been kind of like a flat with a ridge around the edge to correspond with a shaped seating in the body........goodness knows why these appeared ....but they were definately around in the `80s
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