[There is a tradition] regarding the Sandy dun at Bettyhill, where an old woman hid a croc of cold previous to the dun being attacked, and measured the distance from it with a clew of thread.
A disappointingly brief mention in ‘Notes of Cromlechs, Duns, Hut-Circles, Chambered Cairns and other remains, in the County of Sutherland’ by James Horsburgh, in PSAS v7 (1866-8).
Information about the broch can be found here.