My experience of (attempting) to cut/drill magnets is
that they are
_very_ hard, and almost nothing will even mark them.
Mine too. It is possible, but horrendous, to reverse the drill bit, get
some abrasive slurry, and *grind* a hole through a magnet. You gotta need
it pretty bad, and I'll lay odds no-one will build a core memory board this
way.
- Mark