Frequently I have a problem with self-assemble furniture not holding together as well as I would like. The bolts back out over time the legs in our kitchen chairs get wobbly. Or a bolt from an office chair falls out completely and something that used to work stops working. If I don’t notice the mystery bolt on the floor and the malfunction on the same day, I get other problems.
The last time I got a wobbly chair, I had an idea. I wrapped the threads with PTFE tape. (Sometimes incorrectly called Teflon® tape. It’s the same chemical, but Dupont doesn’t make thread-sealing tape anymore.)
Normally you use thread-sealing tape on plumbing by wrapping the threads of pipes before assembling the parts. The tape makes the threads watertight and also helps you tighten them tighter.
In this application, I don’t need the threads to be watertight but I need to really cinch the bolts down, and the addition of a bit more material around the threads will, I hope, make the fit less sloppy and less prone to backing out.
It will also keep them from seizing, should you ever need to disassemble for any reason. You can use a thread locker, but this was Sunday night and the stores were closed and I didn’t have any. I had PTFE tape on hand, and it’s a lot cheaper.