I know several sarsen stone holes have been excavated but I can't find a diagram anywhere.
I'm thinking, if you scored a direct hit and 40 tons hit the bottom of the hole it would make it's own snug fit, whereas if it glanced off the sides on the way down then it would have less force and the shape of the bottom of the hole would be more important. But I do feel if it will actually touch bottom we'll be OK. The only place it could go is forward (since that's the only sloping side) and we ought to insure against that with a bit of buttressing. Maybe Steve can hold the buttressing, as a mark of confidence in his modelling...
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