Hi Paul. I respect much of what you do, and use some of your (marketed) effects. (I even purchased your Notion of Motion from you, which I unfortunately might have to sell due to pesky bills) :(
I used to perform the finger chopper years ago (and occasionally dust if off for friends), but I could never get over the puzzle aspect of the trick. They know you're not going to actually cut off their finger (don't they?), and despite an actual, heart-stopping, double-mishap in 1986, I don't know if scaring a spectator is worth the implausible effect of a blade slicing through a finger without harm.
My point being, if you'd care to contribute, what kind of presentation helps you get around this?
Thanks for sharing...