so if you place projectiles tip upmost in something like a wooden block with appropriate sized holes 7-7.75mm sort of thing and were to place something like a metal ruler with 2-3mm hole drilled through it..only the very tip of projectiles would poke through....simple matter to remove what sticks up and all would be the same....dremel sort of thing...or honing stone in power drill..the dogs nail file drill thing would all work and be reasonably precise.
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