And I scrubbed all the sites I could - so's I could have an undisturbed period of time. What happened ? I spent it rebuilding an Enclosure Act wall and reading many trashy paperbacks in the rain. Latest is dr who - eye of heaven - and seems to be about a rongaronga stone.
I noticed on the Dod Law stone images, behind the cup and rings, a round hole. I'll bet that that is both (a) 2 Megalithic inches across and (b) an integral part of the design.
(Wonder if there's anything left of my tent - will soon know) ...