Another time was assembling a cone hammer's lock work, it's very hard to push the main spring down and insert the coupling into the frame. Since the spring was so stiff and I had been holding it down too long but still could not insert that stupid coupling, my hand started shaking. The spring, spring caps, and the coupling all flied out. I even heard the sound when they dropped on the floor. Soon, I found the spring and one cap, but I could not find the other cap and coupling. There were a few big cardboard boxes holding various kinds of small junk items on the floor, I was not sure whether they went there. Since it's not an option to give up, I spent the whole night without sleeping searching. Finally found them.
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