Dies? who dies??
OK, seriously, a hand tool like file or dremel sure will help, but if you plan to use 20/month then I would suggest a home made CNC machine. There are a lot of plans on the net usually they are simple stepper motor driver with cheap IC's and mostly driven by the common G-code lanquage. Don't be scared by the CNC term. It's an easy to build machine.
Ioannis
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