1) Crush the viagra with a medicine grinder. (or whatever those things are called.)
2) Add 1/2 teaspoon H2O, 1/2 teaspoon flour
3) Stir until it makes a firm paste
4) Massage into the wrist in question. Are you a righty or a lefty?
5) After application, your wrist will remain erect for hours equivalent to the dosage of viagra ingested for the originally intended use. (When you cock goes down, your wrist will become will return to it's normally flexible self.)
Good Luck and remember to use for medicinal purposes only. Over use may cause blindness, fatigue and sleeplessness. If you suffer from one or any combonation of these symptoms, contact the Poison Control Center immediately.