slot 4

https://golf-wiki.win/index.php/Smart_Strategies_for_Maximizing_Gaming_Promotions

I hung my keys on the little brass slot by the door, but they kept slipping off. The slot is just a narrow opening cut into wood or metal, like the ones in a piggy bank or a vending machine. It's also that thin, rectangular space where you slide a coin or a card, expecting it to fit exactly. Sometimes it's tight, and you have to wiggle things in just right.