It's fun to make,
it's fun to shoot,
and not so much fun to kill someboddy!
(If you like you can replace some of the parts.)
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Step 1: The Base
It's easy to make
Step 2: The Counterweight & Hinge
Step 3: The Arm
Step 4: The Sling
Step 5: The Projectile
It's just two round blocks.