I keep my Cinch folded up in my Fire Wallet.
Today I went to Costco and put my Amex card in my Fire Wallet right next to the Cinch gimmick. Normally I have a separate wallet for my CC cards.
When I went to pay the card would not swipe. Tried about ten times and finally they had to enter the CC number manually.
I was aware of the dangers of this but for some reason it didn't enter my mind.
A senior moment.

Hi
Thanks for the warning ! I know this too but it sounds like something I'd do. ;0)
Ralph
P.S
Did you ever come up with a workable patter for cinch ?

No, I didn't. I just keep it moving at a reasonable pace to keep their interest.
I only do it socially, so it's no big deal. But it would be nice.

Ihor

Shaun Robison is one of my closest friends in magic. He likes to patter about counterfeit bills, or the way that bills are made. I played with the idea that bills are developed because of exposure sort of like a photograph. so by folding the bill, I can control what parts of the bill get the light and which parts don't. Then I say that you can also do something called flash exposure where everything gets done at once, that's when I do the change.

Hopefully that helps at all.