CJF
Gunsmiths that Mount new clawmounts on old rifles will likely have "take off" parts that will replace the entire broken "slider". Failing that, it can be repaired. If you take the screw out of the "good" side, it will come off, and the broken part can be pulled out. Note, you will find two small springs inside, save them. If you examine the broken off "wing" carefully under magnification and strong light, you will see that it is also mounted to the broken bar by a screw, like the "good" side was. It has been polished and engraved to hide the screw head. The screw slot may or may not still be visible, but if it is, try to back it out with a screwdriver that has been ground to fit the slot precisely and held in a drill press to keep it from twisting out of the slot. You may need to deepen the slot with a graver. If you can remove the broken piece, just make a duplicate bar. You will notice that the old one has been filed on the bottom side. This was done to fit the hooks to the base, without "play". Don't duplicate the file marks, leave this to whoever fits the new ring (the front foot, "Hackenstuche" will come with a new "plate", prefit tightly to it). After removing the screw, it may need replacing or, at a minimum the engraving may need refreshing. Good luck.
Mike
