This is a box that can hold a PSP2000 sliding joystick. I use it to add a third gimbal for my Taranis radio that will control pan and tilt on a camera. The position is on the back, reachable by my left index finger.
I will wire the X-axis (camera pan) to the S3 pot which is not an existing pot but the connector exists unused inside the radio. The Y-axis (camera tilt) will be connected in series with one of the existing pots, in my case probably the LS pot. This way the LS pot will act as a kind of trim since both the joystick and LS will affect the tilt. I will probably add a wiring diagram once I complete the installation.
NOTE: The pictures show an early version.
NOTE2: The is some information about this still unfinished mod here: http://openrcforums.com/forum/viewtopic.php?f=97&t=6238&p=87918&sid=e59f0da6b3ba5772127e9abd4edd48e6#p87918