Step 1: The Clock
and you need to take it appart.
By the way the clock needs to be one that no one will care about if it gets torn appart.:P
Oh and it needs to work. :P
Step 2: The Container
Anything from a soup can to a altoids tin will work.
Or a soda can, that is what I used. Although you will have to chop it up to make a little sleeve for the clock.
Step 3: Finally
Last but certianly not least you can cover it with duct tape to make it all safe and secure.
All done this is my first 'ible please feel free to critique.