I have a stack of 6 3" ferrite ring magnets from scrapped old B&W box TVs. Demon magnetiser.
Not sure that it's easy to magnetise the super hardened bits though.

I use them in a magnetic holder but they themselves seem to stay unmagnetised.
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History is much like an endless waltz: The three beats of war, peace and revolution continue on forever.
However history will change with my coronation - Mariemaia Khushrenada