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See, I wonder about the orientation myself. I mean, sure. I expect no difference if the "north face" is "in" vs. facing "out." But, what about magnetized through length vs. diameter? I chose through diameter simply due to availability, but I could see this making a difference.
I mean, through the diameter would seem to pull the whole disc towards the surface in one piece, while through the length would pull one end peripheral and push the other end deep. The magnet would pivot really. There must be a different subjective feeling to this at the very least.