Originally Posted by camiller
Wouldn't use 4 magnets like that. If the stir bar happens to connect up first with a pair of adjacent magnets rather than diagonal it's going to get thrown. Just use two with opposite poles up directly across from each other.
+1 Trust me on this. Two magnets is the better way to go. Four magnets just confuses the stir bar and unless you have them perfectly spaced and aligned it will cause the stir bar to wobble, rattle and increase the likelihood of it getting tossed. You want the two poles of the stir bar to couple with the poles of the two magnets. I tried that configuration once and quickly abandoned it.