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There is a problem with using a jigsaw - unless you back the metal firmly against somewaste wood the kigsaw can jump and buckle the metal. Dremel standard cut-off discs are a waste of time on steel cases (I know I have just blown through a pack), but the reinforced ones should work. If you have long straight cuts just use a 4.5" angle grinder to cut close to line then a metal file to get it precisely to measurements
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