When I perform this, instead of having it appear on the clock hand, I put it in 1 of the picture slots in my wallet.
So you can go into a patter like I do saying how theres a special moment where the magic happens. What do you do when you see a special moment?
Take a picture.
Performer: "Where would you put a special picture to have it with you at all times." (say that line to make sure they dont say a picture frame) (the word "portable" is a good word to say too)
Audience: "A wallet."
Open and reveal the corner in your wallet.
When I reveal the corner in the picture slot, I take the card from them and hold it up to wallet to see if the corner matches up with the card before I remove it from my wallet.
I feel it gives a more visual trick so they know that I don't switch anything.
Also, if your performing for someone close to you(family member, you can make this trick really crazy. . . .
Have a picture of them in your wallet and have the corner appear in the slot their picture is. Don't have them in the 1st slot, it's better if their picture is like the 3rd slot in your wallet. And point out that it's only there because they picked the card, so it appeared in their picture slot.
I hope you find this useful. Feedback?