No one to my knowledge has found any, though the possibility exists if you can get the polarization right to cut down two 130 size neo magnets and stick em together and then use those for one side of a 180 can.
lilstagg- I thought it was a combination of both amps drawed from motor and voltage
phread- Yea that was an idea that I have been meaning to try, if that will work you could build some really fast 180s