I've made a simple mod on my gp2x, nothing how can avoid my warranty, but a good way to improve the original joystick.
I simply found an old cheap psx dual shock pad, I removed the rubber cap on one of the analog joystick, and I cutted a circle of rubber (10mm, 2mm less than the gp2x joystick), I made it thickness thin with a x-acto modelling knife, and glued it on the gp2x joystick cap with super glue gel. That's all!

Now, my joystick doesn't slip under my thumb anymore
Not really an "hardcore" mod, but I'm happy with it...and I keep my 1 year warranty
dimitri from France
