From the horse's mouth
I am looking more closely at the Stones with holes which perforate the body of the Stone. Holes c. 8 cms. diameter through 25 +cms of granite with smooth inside bores have to be made with a metal tool, almost certainly steel , as I recon bronze may not manage it. Do you agree? Many have sharp edges at the entrance. I rec on many holes haave been made long (centuries?) after the Stone was erected. One wonders what was the motive and use for these laboriously made holes. Another enigma.
cheers
Rob
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