Effect: A clear see-thru minature Guillotine is shown to your spectator.  You show that the blade clearly goes thru two openings one, a finger size opening, the other a smaller sized hole for other objects such as match sticks, cigarettes, or anthing else you can fit inside.  Demonstrate the power of the blade with no finger inside.  You ask the "volunteer" to place her digit inside the blood thirsty klling machine, telling her that everything will be find and you have placed a spell on the Guillotine or her finger, your not sure witch.  The blade come crashing down thru her finger and chops whatever you have below off!  Your spectator is not harmed!

Clear See-thru style that locks in place for inspection...