incise the bone around its circumference. once the incision is deep enough, it can be broken cleanly.
incise a groove on once side of the bone. once this groove is deep enough, use a stone wedge and a hammer stone to split the rib bone by force.
start grinding away on the smallest piece, and after MUCH time, i was able to produce a VERY pointy bone needle. the point is pointy enough to poke through my thick leather welding gloves, stab me, and draw blood. yeah, the needle works.
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