Hello,
So i received new magnets (less strong) and with a hard disk magnet on the middle.

Close view on the additional fan added:

Making 3mm washer for the fan:

And final test:

Mixing:

Moar !

Here is a video... who seem blocked in some country due to music..

In case you can't view it, here is another link: http://www.dailymotion.com/video/x39mulo