Śīlapālita, in his commentary on The Minor Matters of Monastic Discipline (Toh 4115, F.21.b), explains, “The lever is a way to prevent the door panels from opening. A small wooden peg, one cubit long, is affixed in the center between two door panels. Because this piece of wood turns like a wheel in order to hold the doors in place, it is called a ‘lever.’ ” This is one of three fasteners, along with cross bolts (Tib. gnam gzer) and bars (Tib. phred gtan), that the Buddha allowed to bar doors.