I'm currently building my own controls for the Challenger 650. The first one I built was a tiller for NWS and it works perfectly. When concept proofing, I cannibalized an old Logitech Attack 3 joystick to use its circuit board. I took a potentiometer that I got from a discarded| audio equipment because it had a center detent, I wired it to the THR axis on the PCB and assigned it to Nosewheel tiller in the configuration panel of the simulator. I attached a large knob to the pot and put the PCB and the pot into a small plastic project box. I used it like that for some time while I was designing and building the final control which I 3D printed to make it similar to the one on the Challenger, so I cannot show you a picture of that temporary control, but it was a very simple project that I built in a few hours and that worked exceptionally well. Maybe you can try something similar. I hope it helps.