This is the lock-nut, inside is the nylon ring damping in it, which can prevent the screw loosening. You can check the photo br 2. In general, hand can not twist it, you have to use a lot of force to be possible to screw in. You can ask someone who are professional, they can help you. br 3. And you'd better use our nut, which can prevent the screw loosening.
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