Here is my first instructable: a simple but effective catapult. it fires about 2 feet, but shoots it really high.
it uses marbles, but small sinkers work as well.
Ready to build: continue to step 1.
Step 1: Parts
Step 2: Frame
Then, join them together. see last pic.
Step 3: Tensioning Mechanism.
First, set it up as shown in the first two pictures.
Then, wind a turn on until you see picture 3.
Step 4: Ammo Arm.
If you know what it's called, comment & tell me.
Step 5: Stabilisers.
Then, Add stabilizing rods.
Step 6: Done!
Enjoy the catapult and win your office territory back.