Screw-nut for eyeglasses

The nut on the screws for poluprecnik and bezopasnykh points.
Detail which often serves to fix the glass to the rim, you can put the seconds passed. The attached video with a description of the part. Also see the set screws nuts washers to score points. If you are engaged in repair of spectacles without nuts in your kit parts for eyeglasses, it will be impossible to do, as they are very often out and lost. Nuts are also useful for connecting two parts (shackle, junction, repair points), this is good to use them in conjunction with the screws.