We have found these guns cocking handles have a tendency to snap off being made of a weaker non-magnetic metal.  To make matters worse getting the broken portion out of the bolt can be a nightmare.  Our handles feature tough stainless steel and should last a lifetime.  These are a direct fit for the  Artemis/SMK/SPA/Seneca/Stoeger CP1-M, CP2-M, CR600, MRODAIR/ Plinkster, Dragonfly & LR700W.   Since they just screw in/out replacing is simple.  If your old handle wont budge, remove orings, put on vice grips with rubber to protect then loosen.  NOTE when installing our handles use blue thread lock and only hand tighten to protect the bolt threads.