http://www.google.com/url?sa=t&rct=j...SZ4j-ZKiQY810g
This is the PDF of the calculation of a printed circuit to create a multipolar magnetic field !
This is the solution by creating a printed circuit it become easy to go beyond the limit of 1mm pôle and also very easy to make specific off center circuits!
The guy that refuse to give me a magnet will regret it now, but those of austria microsystème will not regrets the 3 samples they give me!
I try to find someone that can calculate the shape of the printed circuit (hey young engineer of austria that is work for you) i forgot my math too long time ago !