no problem: all they have to do is glue on a couple slugs of steel...then they can take advantage of "the magnetic fields that control the universe".

Plus: I'd add that these are very elegant lights, a fine design but as with many minimalist designs there are limitations:

When you remove them, won't they switch on again when they come in contact (proximity) to anything ferrous in your pack...including each other's magnets?

Assuming the beam is just perfect when it's mounted to a 17° angle like your typical headtube and seat tube, wouldn't it be nice to be able to re-aim it just a bit, in case your angles aren't perfectly 17°?

Otherwise, I'm impressed.