Matchbook, because it’s a wedge . . .
https://image.nostr.build/16f57988e1817354b4a4e68b6853cd5e2e67ba560ac67b46f0c09d04ac755cb8.jpg
nostr:note12aplpz3r6ncg8y2cjah29yy0trfqll3w83yl906twtel3e6ee0ys...
and if you didn't have a matchbook, a folded up piece of paperboard or a couple business cards would do the trick
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