Armbuster - Andrew Mayne - General Magic trick

Andrew Mayne, creator of Bisection and author of Touching Sky
presents a brand new shocking magic effect. Armbuster!
Place your arm into a "magic" cast that prevents you from being harmed.

Then, bring out the wickedest looking drill you've ever seen.
Proceed to drill a hole straight through your arm (blood is optional).
Of course, when you remove your arm from the cast, it is unharmed. Thank goodness!

The effect can be built in under a half an hour using $10 worth of
materials and a $20 cordless drill.