I recently bought an arcade machine running MALA, MAME and NES, SNES and Genesis emulators. I've been configuring controls for the various systems, the only problem I'm having is I'm not able to assign anything to the lower right button of the gamepad, this goes for both Player 1 and Player 2. I don't think it's broken, does anyone know why I'm unable to use this button? Sorry, I don't know much about how it was built, but I've included images of the inner workings. I'm very new to this, so thanks for your patience.