You will need:
a piece of clothe aprx 4x1-1/2
Step 2: Cut your strings
Cut 2 strings a each a little longer than 2 feet
Step 3: Cut Your Rock Carriage Material and Puncture it
Cut a peice of material that is 1 1/2 by 4 inches. The material should be a strong fabric or rawhide. Then take a sharp tool and puncture a hole big enough to put the string in.
Step 4: Tie the Strings in
Now tie in the string by first putting it through, then tieing 2 overhand knots. Do this on both sides with each of the strings
Step 5: Tie the 2 strings together
Tie the 2 strings together using a fisherman's knot
Step 6: Throwing
To throw, place a rock in the fabric. The rock should be big enough that it comes to the edge of the fabric. Then cock back your arm. Bring forward your arm like you are throwing a spear and the rock will be released.