Some years ago I bought a Futaba two stick radio control transmitter, modified to the new 2.4GHz operation (I could get on with the toy-like feeling ones I had bought compared to my old 27MHz JR set from the mid to late 80's). Computerised, memory storage for different models, lots n lots of adjustments and no idea how to set any of it up. I messaged the seller if he still had the manual - nope, he'd never had one either. Rummaged around the net, could only find foreign language versions. Emailed Futaba in Japan . . .
In the meantime, for some reason, I removed the foam liner in the branded protective case it had come in . . . and there was the manual, where an owner previous to the guy I bought it from had left it
Which does remind me, Futaba in Japan never replied . . .
