Wedge to keep snug?
Bingo. Pretending to do actual joinery
I once saw a 'wedge' in a similar design but it was a thin splinter glued into a routed line.
Splinter first, with as bit of glue, hammered into the routed line, then the bit that's left poking out is shaved/sanded down so it's flush, then varnished/finished
@CYOA started
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Bingo. Pretending to do actual joinery