The hooks on our chains are imbued with excellent strength.  Though they are very flexible, they are not designed to be bent repeatedly.  Rather, the attachment circle at the opposite end is intended to slip perpendicularly into the gapped opening of the hook.  Place a bracelet around your wrist, pull your arm toward yourself so that the bracelet is trapped between your arm and body.  Make sure the hook rests on your wrist.  With your free hand, draw the other end of the bracelet up and around from under your arm.  Envision the attachment circle as a knife blade and the hook as a cake.  "Slice" the circle into the hook.  The hook should not be bent or twisted open. It should remain closed, with an opening the width of a sheet of paper.  The circle should gently push the sides of the hook apart just enough to pass through the gap.  When you take off the bracelet, hold the hook upward until gravity drops the circle into the hook gap and then pull the top of the hook up until the circle is pulled downward into the gap.  A properly-gapped hook should emit a soft but audible "snap" as the circle leaves the hook. Tugging the hook in this manner will not damage the jewelry.  Repeated bending of the hook, however, will cause the metal to fatigue and ultimately break.  If a hook does become wrenched open, gently but firmly shimmy the crook of the clasp side to side and back and forth toward the body of the hook until the correct gap is re-established.