So as a new owner I am a little paranoid about what I can and can not use. I see all the other threads about what magnets are being used but none that answer my question.
We have several of these bar magnets that come from Harborfreight and are pretty cheap. They fit well in the GF and are low enough to have a good amount of clearance between the honeycomb and the head.
We just wanted to make sure that there was no issue with putting them in the GF before we continue to use them. They are metal cased but they are wrapped in ductape now.
OH! and if you look on the main page there is a FREE coupon for this magnet bar as of right now.