Originally posted by Two Tracks: Bottom limb only because the loop is around the top limb most of the time.It also will "hold" the string for you and give you something to twist against.Flip the bow upside down and pop the string off the bottom nock, pull it snug and give it a few twists. Then put the loop back in the groove. string the bow and see what you gained. It makes no diff.top or bottom tho.Chuck