Enlarged photos give a false impression of the size of the gap.
I would think 1/16" or less which is easily explained by shrinkage of natural materials, besides nothing else fell out or was removed and why would it be, all parts encircle the tang and are held tight to each other?
Disassembly does break parts and you then have more issues to deal with.
As they say: "If it ain't broken don't fix it "
Just my opinion.
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