The outrageous Trethevy Quoit......... one can almost imagine the hole being employed to tie this rearing mustang of a dolmen down.
Image credit: Robert Gladstone
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That is massive indeed. George Borrow got a bit carried away when he saw it (I would blush if I wrote what his books says). I can't find any folklore which is strange. Unless such things are so commonplace in Cornwall that they don't deserve mention. I saw this
books.google.co.uk/books?id=Z8xCAAAAYAAJ&pg=PA237&dq=%22trevethy+stone%22&hl=en&ei=yZBJTOLVAdOIsAbr_vymDw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC0Q6AEwAA#v=onepage&q&f=false
which suggests someone was once using it as a tool shed. How very practical.