loose headstock

例句：

1. 1.The loose headstock caused the machine to stop working properly.
   松动的头架导致机器无法正常工作。
2. 2. The mechanics had to tighten the loose headstock before they could start the engine.
   机械师们不得不在启动引擎之前紧固松动的头架。
3. 3.The old car's loose headstock was causing it to shake and rattle.
   旧车的松动头架导致它摇晃和发出噪音。