[Mondial]

Another suggestion is to use a jewelers saw to cut the can instead of a knife. I originally used the knife method, but it was difficult and time consuming, and found it distorted the edge of the can.

The jewelers saw blade is only a few thousandths of an inch thick, has very fine teeth and produces a precise clean cut with no burrs or distortion. The saw is also very useful for all sorts of metal work like cutting volume control shafts, etc. Definitely a handy tool to have. They are very inexpensive on ebay:

http://www.ebay.com/itm/JSP-Jewelers-Adj...SwJQdXDCkr