Bow door width is 90, and bow door width is 4 1. How to configure it manually?

The width of the bow door is 90, and the width of the bow door is 465,438+0. Pull configuration: slingshots above and below the aiming point are suitable for pulling 85-80 arches on the ear and 80-75 arches on the elbow. Slingshot became popular in 1970s and 1980s. Slingshot is a cold weapon or a game tool. A slingshot consists of a bow, a rubber band and a leather bag. It is a "ya" shape made of branches. Rubber bands are tied at both ends of it, and a piece of skin wrapped on the projectile is tied in the middle of the rubber band.