The rubber ringlet can be put on a pulley without demolishing and without removing CD-ROM (DVD-ROM) from the place. If the frame is not advanced itself, it is necessary to advance manually by means of a needle or a metal paper clip. (By means of the needle push the fixer being in a special hole on the front panel). By means of tweezers the belt carefully is removed. By means of two tweezers the prepared ringlet is put on the pulley and aligned on the pulley middle. The belt is put into place.