大钳销子和铰链必须定期检查磨损情况，如果磨损严重要更换。
Rig tong pins and hinges must be inspected regularly for wear and replaced if any wear is observed.
每次使用完毕后请仔细检查头盔是否损坏，如果头盔已磨损严重但无明显损坏，还是有可能需要立即更换。
Each time after use please carefully check that the helmet is damaged, if the helmet is worn out serious but no apparent damage, also is likely to require immediate replacement.
左手卡住外圈，右手捏住内钢圈，用力向各个方向推动，如果推动时感到很松，就是磨损严重。
Left hand, right hand knead stuck invading. this within rims, force in all directions to push, if push felt too loose, is badly worn.
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