English: Vector diagram of a snap matchlock of Java. This vector image is adapted from Blackmore , Howard L. (1965). Guns and Rifles of the World. New York: Viking Press. The brass mainspring A is fastened to the outside of the lockplate where it presses upwards on the tail of the cock. The sear, C is a simple piece of iron, one end bent to protrude throughthe lockplate and catch on an indentation in the tail of the cock, and the other bent round so that the separate trigger can act on it. A flat leaf spring B bears on the end of the sear with a forked hook.