Most knobs unscrew and can be replaced. If X doesn't, yes you can replace the entire joystick. I haven't seen inside the X console but would guess everything will be attached with slide on connectors to the microswitches. Best brands of sticks are open for debate and may rely on your location what is available. Personally Sanwa is my 1st choice and Zippy make a good quality and great value stick at close to half the price.