nostr:npub163k0gvm3x8s7qqjnukf6a2jq4nus3s74j7y64pctcgrwy3nmsllswwhljx it generally will fit, but not snugly; so i'd reckon the bottom of your can is out of round slightly. i've never seen a gap as large as the one you show there.

P.S. pringles cans do not make the best cantennas. Pirouette cans do.