Build a trebuchet in five minutes

Have you ever wanted build your own trebuchet and fling cows onto unsuspecting englishmen? Well now you can (assuming that your cows are the size of marbles). Here is how.

First off, you will need a few things:

5 rulers with multiple holes in both ends
A large nail or bolt (must fit through holes in rulers)
Two very small nails
Some tape (duct tape works well)
Some string
A heavy keychain or something else which can work as a counterweight
A brick or block of wood.

Alright, lets get started!

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Step 1: Attach rulers to brick

Putting the brick or block of wood on its side (drawings do not show this), tape the four rulers to the brick as shown, so that the holes line up, in order to build the support structure. Figure out what angle the rulers should be calabrating them so that the holes on the rulers overlap, and you can line the third hole of your remaining ruler up with these holes while its bottom hole is slightly above the brick. Once its lined up right, tape the four rulers in place.