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I would love to see destructive testing on these spears.
I know it sounds terrible to want to break things this nice, but we know historically that they were effective. I've always wondered about reuse. It's a LOT of labor to end up being single use. I'd love to see how they hold up against misses (rocks, dirt, gravel, etc.) and against flesh/bone.
Rocks and gravel are easy to get. We can get bodies from the Texas HTF.
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For the reasons you suggest, I suspect 'points' from Clovis time through lost lake times were almost always knives; not projectiles. Bone was used for projectile tips.
Later, stone projectile points came with stemmed points; no notches. The width of the stems were sized to fit snugly in a hollow bone. Otherwise no hafting. They would have worked fine piercing flesh so the momentum of the spear or atlatl dart could push it deep. To hold a point in this way would take nothing like the effort to haft a point on the end of a shaft. A single dart might be used multiple times by pulling the bone end off the shaft, quickly replacing a broken point by pushing the remaining snapped base out and replacing it with a new blade, remounting the bone end on the shaft--in seconds.
Later, much later, when the bow was invented, smaller notched points reappeared and were hafted. Probably the old stem-in-hole method of mounting was too heavy for an arrow.