The returning force of the thread take-up spring is insufficient.
挑线弹簧的回复力过强。
The Looper thread Take-up can make it up and down for threading easy.
升降式底线分线盘，使穿线更容易。
Do you have pictures take in the airplane? If yes, we can kick-start the topic by opening up a new thread.
你有在那飞机上拍的照片？如果有，我们就可以开个新版而开始这个主题。
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