The Office supplies trebuchet

Step 9: The base

Mark the base with a center line. The two lines are about 3" apart and the little Xs on those lines are also 3" apart.

EDIT: Cut the card to 3"X6" with the grain of the corrugation laying along the 3" distance. Mark the center line along the 6" distance and two lines 3" apart at right angles to the center line.

Comments

[samando]

so you need a pen as well