Modern glasses, in spite of their diversity, have identical mounting handles to the frame. However, the designers made them so that no special tools to replace the broken shackle is not easy: it is difficult to seal with the rim of the cog due to the fact that the lug shackle is retracted by the spring into the slot and the axis of the fastening parts holes shifted relative to each other. To get out of the situation, you can seal the details of the little stud (preferably copper or aluminum, so as not to spoil the thread in case a professional repair) – its edge passes freely into the offset holes. Further tapping on a stud, his stud enters the hole to the cap, pulling the lug out of the slot. It remains only to blunt needle files sharp tip cloves and slightly bend it to the new axle did not drop out.