Things You'll Need
Instructions
Carve a bowl-shaped depression directly into the end of the catapult's throwing arm. The objects to be thrown can be placed inside this depression. This basket type is used for a fused-arm catapult where the basket and arm are made of one piece.
Attach a wide plastic, wood or metal bowl to the end of the throwing arm to create a catapult basket with greater capacity than the fused-arm catapult's depression basket. Drill through the bottom of the bowl and attach the bowl to the throwing arm with screws. Do not use nails or glue because nails will pull out over time and most glue won't hold, as the force generated by the catapult is considerable.
Assemble a sling out of sturdy cloth such as burlap or nylon. Cut the cloth into a square and cut holes about an inch from each of the four corners. Tie a piece of rope between the holes in the corners on one side of the cloth and tie another piece of rope between the holes in the corners on the other side of the cloth. The resulting creation will resemble a hammock. To use a sling basket on your catapult, the throwing arm must be altered. Insert a round dowel through the width of the throwing arm at its end. Hang the sling basket from this dowel. Secure the loops of the sling by using additional rope to tie the loops to the dowel.