fair enough, just you made it seem simple, but it's not always easy to find something to charge the pin with, you oversimplified it.
Its been a long time since I made one but I seem to remmeber that a steel needle would be sufficient as most grades of steel are magnetic. Therefore it is influenced by the Earth's magnetic field whether you magnetise it or not.
I might be wrong. Been a long time since GCSE science classes.




