This is not knowledge that anyone simply has; it is knowledge that is acquired through practice and possibly through transmission from more experienced practitioners.

The precision of the modifications documented at Loch Borralie — the specific forms produced, the consistent approach to multiple bones — suggests someone with established knowledge of how to work bone.

The skull work is similarly specialized.

Knowing how to fracture the cranial base in a way that opens access to the skull interior without destroying the skull as a coherent object — and then knowing how to use a tool inside that confined space to clear soft tissue — is not something that would be done correctly on a first attempt.

It requires either practical experience or access to transmitted knowledge about the correct technique.