bottom balance endpiece screw

例句：

1. 1. The engineer used a bottom balance to ensure the machine was running smoothly.
   工程师使用底部平衡确保机器平稳运行。
2. 2. The balance endpiece is crucial for maintaining the stability of the machine.
   平衡端板对于保持机器的稳定性至关重要。
3. 3. The screws were tightened carefully to prevent any loosening during operation.
   螺丝被仔细拧紧，以防操作过程中松动。