This topic has been dealt with extensively in past threads, do a search. The basic answer is well explained in post #4 by ithacaartist - add flexible/compressible material. The wood has shrunk; wood is hydroscopic and absorbs or sheds moisture depending on its environment.
I purchased a small sheet of 1/32 nitrile rubber years ago for shimming grips and it works perfectly.
While adding moisture via steam or other methods might swell the wood and thereby tighten fit, such a fix will likely be temporary. And introduction of moisture creates its own issues.
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