I apologise from the off, I am very much an amateur when it comes to electronics, as you will tell with my photos.
I have purchased on of your adapters, thank you, and i have soldered (poorly) all the parts. I have wired it up correctly as best as I can tell and installed SNESDev. I note that Snesdev is running as even when I have no gamepads connected, it shows up as 2 gamepads detected in Emulationstation.
HOwever, no gamepads are recognised when buttons are pressed. If I Jtest them, still nothing. The axis number does not move from -32767
I have no idea how to even test the button on the adapter, I did apologise earlier!
Ive attached some photos for your perusal. I have extended the cables as the ribbon you provided is a little on the short side!