Many years ago I made a finger chopper style device out of playing cards. It was from a book and all I can remember was that you had a gimmick that was put built by stapling cards together, and you put your thumb through a hole cut in the middle of the card contraption. I can't remember if it was a chopper type effect or something else. I do know it's not the Andrew Mayne version that uses a dollar bill, (though it could be an Andrew Mayne effect. I believe it was a downloadable PDF or in a book). This one used only cards. Any help sourcing this would be great.

And of course I immediately found it after I posted! Steve Fearson's Thumb Thing A great effect btw, worth picking up if you like that sort of thing.