I had the same problem with the screw-on terminals coming loose over time, which I cured with some shakeproof washers - £0.20p from the local hardware store. A drop of Loctite on the threads could also work well.
You can gently lift the splines on the banana plugs with a small screwdriver and maybe slip a small length of thin copper wire under a couple of the splines to make it fit tighter into the socket. A bit fiddly perhaps but it is a permanent solution for any banana plugs with splines.
"Z" plugs are better than the vast majority of inexpensive 4mm banana plugs.
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Originally Posted by Gazjam

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