@Joao
Yeah, shame on me. I think I`m getting old ............
Anyway, here are some details about my podmod.
I use the Honeywell hall sensor device SS495B
http://sccatalog.honeywell.com/imc/prin ... &PN=SS495B
The advantage is that it works directly with 5V with a linear output. And it can be used as a direct replacement for the stock pot. Except it is now important to connect the leads to the correct direction of plus and minus !
The magnet is a neodymium type of 2mm, cube or cylindric shape. You can get them from ebay or somewhere else. I put the magnet in place with a drop of superglue and after that I put some very little epoxy around. To make life easier I am going to build a little positioner tool for it.
Oh yes....., without it was a mess to fiddle around with this little tiny things to find the correct position and distance and on top of this the pot housing is made of iron sheet metal and it loves little tiny magnets.
However, it is very important to position everything correctly for center and voltage range to get the full resolution out of stick travel.
It would be much easier just to glue magnet and sensor in a raw position and use a little smd opamp board to make the fine adjustment just before doing calibration by the firmware.
I made some scale CAD drawings of all parts and will post them when I have revised and updated.
I hijacked the nice picture from bob195558 and make some ugly drawings on it to show vaguely how it is assembled now.