The Curiously Strong Trebuchet: A Pocket Sized Medieval Siege Engine

Step 8 Prepare The Case

First, use a 1/4 inch drill bit to drill two holes in the lid in the manner shown in the picture below (drill out the black circles). To make the wholes nice and clean, drill on top of a piece of scrap wood. Then, cut two small slits (about 3/16 of an inch deep) in the front of the bottom part of the tin spaced one inch apart. This means there should be one cut .5 inches to the right of the center point and one cut .5 inches to the left of the center point. Cut two slits in the same way on the back. Now, you should have two flaps: one on the front and one on the back. Fold the flaps inwards with a pair of pliers and crimp them flat to the inside of the tin. The bottom of the tin should now look like the second picture.