OK heres the final sequence.
Once you remove the parts as shown above do, this:
1)Observe the hole on the sprocket, I had my MOD in place already when I started making this tutorial so I wanted to avoid ruining it by removing the screw and the magnet already shown in place here. This pic showns how and where to drive your screw to place the magnet. I advise you to give it some glue in Order to avoid the magnet from slipping out of place if you kick the stick arround. :)
2)Place the sensor mount.
3)observe if the magnet moves freely arround the sensor with your stick imput.
4) With a tooth paste (or something pointy made of plasty, not magnetic) and adjust the magnets position untill you achieve what the 4rth picture shows. And repeat all these steps from start for the remainder axis
5) were almost there... :) Screw the square frame and the bottom of the base back in (as shown on the fisrt picture of part 1)
Note the parts that are left out in the end, keep them somewhere safe in case you need to restore the stick to original condition later.
Thats it, test your stick, but be mindfull that I wont be held resposible if you are too clumsy and break anything, specialy during the screw placement on the sprocket (1 of part 3, here).