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What if the steel bar is ground into a needle?
Need to change the screws.
When the steel bar is ground into a needle, the thread on the steel bar will be worn due to friction and pressure during grinding. When the thread is worn to a certain extent, the connection effect of the screw will be affected, and it is easy to loose or connect abnormally. Therefore, in order to ensure the quality and safety of the needle, it is necessary to replace the screw in time to ensure the reliability and stability of the connection.
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