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nigelswift wrote:
Keying points? Do you mean those two nobbles? Are you saying they are deliberately constructed tenons? Or natural ones? And are there mortises?
Wait and see but where do you think the 'lid' would be today if they weren't there and the tops of the sloping sidestones smooth?

Well I'm not sure nobbles would lend more or less resistance to slippage unless they were fitted into mortises, when they'd clearly provide more.

But that would be a big claim, the only mortise and tenons other than SH.