Catapult for laying siege to your Office mates

UPDATE: New version for 3/8 inch dowels. This is untested. Stay tuned for more.

Print:

4 Foot Joint2 2 Top Pivot 1 catapult arm 1 Ball thrower arm As many Balls as you think you might need

Collect 11 BIC Round Stic pens and 1-2 rubber bands

Remove the ink and tips from the pens and assemble the thing so it looks like the picture. Use tape as a shim to tighten up loose joints. The Pen body that the arm is on should rotate freely in the 'Top Pivot' piece.

Lay siege to the office

Update: for 3/8 inch dowel version replace 11 bic pens with 11 3/8 inch dowels 4 inches long.