When you clamp work in your bench vise that doesn’t match the width of the jaws, or uses one side only, you risk racking the jaws because of the uneven pressure. My solution was to make a series of L-shaped spacers that range in thickness from 1/8″ to 1-1?2″. I marked the size clearly with a marker, drilled each one, threaded it on a piece of string and hung it near my bench. When necessary, I use two spacers back-to-back.
– Willard Anderson
Chapel Hill, North Carolina