Today, when you order "Heavy Metal trick Sam Woodrow", you'll instantly be emailed a Penguin Magic gift certificate. You can spend it on anything you like at Penguin, just like cash. Just complete your order as normal, and within seconds you'll get an email with your gift certificate.
A bolt and nut with a washer threaded in the middle are handed out for close examination. The assembled hardware is dropped inside a paper bag and the magician claims that with "just a few shakes of the bag" he can loosen the nut, slip off the washer, then actually screw the nut back onto the bolt! He then does precisely that, and everything can be once again examined, including the bag!
Heavy Metal comes complete with the specially machined hardware, paper bag and illustrated instructions with a full professional presentation.