The Ego-generation 2 adopts the traditional rubber band to fix the needle bar. The rubber band 12 is the most suitable. The machine is sample and easy to operate. The vice tube is also easy to use, as shown in the figure , unscrew the knob in clockwise, rotating the knob to fix the tube . Attention: the vice tube is plastic, it is very tight , but do not use too much strength , or you will broke it. Lubricate the position F every 2 weeks. The Ego machine surface is anti-virusly sprayed , so we suggest you to try to keep it clean . Matters need attention: Ego generation 2 is not compatible with cartridge needles. There are many many types of soft and hard nipple for you to choose as the best feeling you think .