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Removing the Dome:

Take care when working with the bottom of the can, since the metal is strong and stiff. The key here is that you need to make a sharp crease and bend the metal back exactly along the crease so it fatigues there and separates easily on its own. Be extra gentle when working with the last bit, since its narrow width makes it harder to work. Of all the techniques shown on this website, this is one of the most difficult to get right.