when you first receive your vending machine you're going to get a lock in two keys usually there in the coin return or in the delivery bin simply remove the lock and keys and to install it inside the t-handle you simply take the key insert it into the lock and open it so the the tab on the top is down the next thing you do is you simply take it and insert it into the t-handle and turn it until you hear it click and then you simply take the key out push it in and it's locked to open it just insert the key spin it and the t-handle will pop out to lock it push in you