I have a PV+ and replaced the broken stock camera with a Zenmuse / GoPro setup. I tried the 7th channel lever solutions you see everywhere, but was never happy with the camera drifting up or down unless you get the lever in the exact right spot to stop the movement. So I made a run to Radio Shack and picked up the potentiometer and knob thinking it would be easier to hit that magic 'neutral' zone to stop the movement if the knob was visible and on top of the transmitter. While I was there, I came across a second possibility but I wasn't confident it would work. Bought both setups for a whole $12. We know the potentiometer will work as evidenced by the countless YouTube videos on how to install them. So I thought I'd try my other option first. A 2-axis mini joystick. Why? Because it naturally snaps back to neutral without having to put a dial or lever in the correct location to stop the movement. Exactly what I really wanted as that's what the upgraded DJI transmitter does with the tilting thumbwheel control. I started off by opening the transmitter and removing the top dial from the circuit board. Then I soldered wire leads in their place. Then I soldered those leads to the joystick (took an educated guess as to what went where) After a quick test, I was pleasantly surprised that it totally worked! Then I drilled a 3/8" hole between the two flight control joysticks and 3/32" holes for the mounting screws (#4 - 40 x 1 inch) Pre-packaged screws from Lowes I tightened the tiny mounting screws, put the transmitter back together and recalibrated! I did have to ream out the 3/8" hole with a small round rasp file to keep the joystick knob from hitting the wall. When it was hitting the wall it would go up very slowly. After giving it some more breathing room it moves at a nice speed in both directions. I'm really happy with how it came out. Hope you find this interesting as an alternative to the lever and knob solutions! Happy flying.