More follow-up and questions about furniture connecting nuts.

More follow-up and questions about furniture connecting nuts.
I finally installed them a couple days ago. And I tried to tighten all the other ones, and all but one was loose, at least a half turn but often 2 to 3 turns. Why?
Is this because the wood shrank since the furniture was made? The legs of the ottoman, and maybe parts of the chair, had been bent. This requires steaming them, right? Wouldn't that alone make the parts swell and it would take a year or two to dry out?
But even if they werent' bent or steamed, it's likely that the wood of all but high quality furniture would shrink over 10 or 15 years, yes? That's probably how they lost the two missing nuts.
---- The only connecting nuts** I was able to find were at HD. On the net there was only wholesale, and even then 1 or 2 pages out of 3 just said, Miscellaneous hardware, and didn't have pictures or specs good enough to pick out what I wanted.
**Those are the flat nuts, like rivets, that tighten with allen wrenches and have a shaft that connects to a similar nut on the other side, used in furniture like a chair and ottoman.
Also, the original threaded rod was better, because it was bigger in the middle, lengthwise, and had two or three teeth around the middle, that bit into the hole and made it so it didn't fall out, and was harder to turn when tightening the nuts. So I only replaced two nuts, no shaft. The after-market ones had a threaded shaft that was the same for the entire length. However it would have been good enough.
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Wood constantly changes with the seasons and humidity. Over many changes, the nuts may have loosened quite a bit.
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