This bears resemblance to the MIA well from the Broch of Breckness. The excavator suggested I pass my fieldnotes and images to “Discovery and Excavation in Scotland” but I couldn’t find any graph paper for the intended plans!
August 10th I found that it is now covered by an upturned pallet with a big bucket on top of that, whether to prevent further damage or to protect people from it I know not.. Nothing else has changed.