Set a bench vise at the needed angle with this lock nut assembly for a swivel base. Turning the handle tightens the base and helps keep the vise from rotating during use. Replacement may be needed if the handle is bent, the threads are worn, or the base will not stay locked. Support the heavy vise before removing any hardware. Tighten the...Read more new assembly by hand only. Never use a pipe or long bar for extra force, since too much pressure can bend the handle or place added stress on the bolt.