Another test from SMALLATHE channel. Saar calls these "Skeletonized Diabolo" and are made from solid brass and an allen countersunk screw. Since SO many people really believe that rifling cures everything from a broken arm to a broken contract, it was a good opportunity to dispel this conception.
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Music from YT audio library
Skeletonized Diabolo Projectile - Spin Makes Everything Better? ─ TAOFLEDERMAUS
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