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What’s the best way of keeping the screws in my shotgun tight?

One of the screws which attach the fore-end wood to the iron on my gun keeps shooting loose. The screw passes through a clearance hole in the iron, and is threaded into a metal insert in the wood. What's the best way of keeping the screw tight?

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Technical
MIKE GEORGE says: Firstly, don’t over-tighten the screw, or you could pull the threaded insert out of the wood, or even strip the thread. Then you would be in even worse trouble!

Best way of securing the screw is to remove it, clean off any oil, and put it back in with a smear of Loctite thread-locker on the threads.

The grade to use is Loctite 242. Stronger grades (and there are quite a lot) may lock the screw in so tightly that you would never be able to take it out again. Grade 242 should hold it in place, but also allow disassembly with ordinary hand tools.