i use a fine metal blade in a jigsaw, if the jigsaw as adjustable forward sweep, the set to minimum, ie.. the blade only goes up and down, cutting on the spot, not lurching forward and ripping into it for a fast cut.
once cut, i swiftly run a stanley blade around the edges (drag it along, just past 90 degrees) to clean them up, usually i’m flooding it so it doesn’t matter if you expose a bit of silver ally skin underneath.
make sure and wear goggles though, it flies everywhee!
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