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If you are going to use a file to remove material.
Obtain a couple of 'super' magnets and attach them to the file to magnetize it.
Remove and replace the magnets a few times and check for magnetism.
There is another way to magnetize.
Using a suitable length of insulated wire.
Wrap it around the file 4 or 5 times.
Then momentarily touch the ends of the wire to the battery posts of a 12 volt battery.