This Haynes Guide to Dalek T-Shirt should show you how to repair your Dalek in the event that it stops working. I guess it could be used to break them too, which is just as handy.
Too bad this isn’t a real book. Then everyone would know how to dismantle a Dalek. But a shirt is even better. Stay warm and clothed while advertising the Dalek threat. It may save someone’s life. You never know when you might need to fix or destroy a Dalek.
The Haynes Guide to Dalek design is on a navy blue, 100% cotton shirt. It is only $19.99 from ThinkGeek.com.