Let's Make an Arrowhead; Breaking Rock 2 with John McPherson Renowned primitives skills expert, John McPherson, takes us through one hour of non-stop flake removal to show how the secret of making an arrowhead is not so secret. Step by step, flake by flake, the mystery is removed and science prevails as John, making two arrowheads, shows how to overcome various obstacles. 60 minutes See John McPherson's other primitive skills videos on the Primitive Skills page.