It won't be the bolt.. There will be a crush washer (copper or aluminium). That probably just needs replacing.
If you can't get hold of one (any bikeshop will have them), you can soften the old one with a blow torch and tighen it while its still warm.
Don't use thread lock ! It's too wet for it in there.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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