I just used an old expired debit card. The two points were at about 11 and 4 o'clock.
It will begin to move when you do it more than an audible click was my experience. Naturally the other side will sort of tighten but still was able to get the card in there. The harder part was figuring out where the to release the collar but it's obvious if you look at it for a minute.
It did ruin the card so don't use one you want to keep lol.
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