Sometimes wood breaks. In the old double-hung window repair world, this most frequently happens on weight pocket access doors. Occasionally jambs are made from boards with squirrly grain, or previously unopened weight pocket doors have kerfs cut through knot holes. When this happens, the pressure exerted to snap open the door can result in breakage. When you’re in the field there isn’t a lot of time to glue and clamp a broken board so we often use super glue and super glue activator. This practice only takes about ten seconds to cure and leaves a solid bond.