Primitive Technology: Stone Axe (celt)

I haven't read Postrel, but the idea of twine being necessary to secure a stone tool to a wooden shaft seems wrong to me. Jon Plant secures a stone tool head to a shaft by building a stone axe called a "celt" with more primitive methods [0]. The friction fit he achieves is likely more robust than a twine lashing because it helps deliver a higher impulse to the work-piece than a mount made of cordage. [0]: ▶ this video

If this fascinates you, be sure to check out this video on making a Celtic axe using low tech methods. ▶ this video This entire channel is fascinating and strives to be very “authentic” about doing everything without turning off the camera and cheating.

The state space here looks pretty small, it seems to me that with so much training it's just a case of brute-force search. When I think of "tool use" in regards to the intelligence of early humans, I imagine something more like [0] where the state space is enormous and it takes a good deal of reasoning and planning to get to a desired result. [0] ▶ this video