How to make a slingshot? What rubber band is suitable?

I don't know how old this guy is. My buddy has been playing slingshot for more than ten years. He thinks slingshots are better than guns, and the * * army has banned guns. I'm still playing, so I'll tell you what you need: making slingshot mud balls: the best material for making slingshot mud balls is clay (that is, red lump soil or hard soil). First, soak the glue in water. Just press it with your hands, throw it back and forth, and throw the mud away. Just pull out the right amount of mud and rub it into a ball by hand. It will usually be the size of a glass ball. After it is rolled, it will be dried on the flat ground and can be used. This kind of clay ball can be compared with stone. Manufacture of wooden slingshot frame: generally made of tree forks on willow trees. Choose which fork is straight. When you stop your hand on the fork, you can see that it is an isosceles triangle. Remove the skin from the cut fork and dry it naturally, not in the sun, because it will crack in the sun. Set the shape and screw it on, that is, a wooden screw with a ring and a wooden slingshot frame will be ready. Manufacture of iron slingshot frame: If you haven't seen a slingshot made of iron wire, it will be taught face to face, which is more complicated. Rubber band: generally use the kind on the valve core of bicycle tires, buy 4 yuan. Each piece is cut into two sections with the same length. If possible, you can use a rubber bladder. Pocket: you can buy it at the place where shoes are repaired. It is best to buy cowhide. Tips for playing slingshot: slingshot has no sight, but it can be estimated that the left hand holds the slingshot frame horizontally, the right hand pulls it horizontally, and the eyes are fixed on the center of the rubber band and the center of the slingshot frame, and the center point is aimed at the place to be hit. Note that when tightening the rubber band, the rubber band should be trained into an isosceles triangle.