EXPOSURE DIAL/MENU DIAL ON THE BACK OF THE CAMERA... WHERE CAN I GET ONE.... OR TWO????

I HAVE ABOUT 5 OF THE ORIGINAL SONY XRAY CAMS HERE MADE IN 1998. EVERY ONE OF THEM HAS A VERY JUMPY DIAL . THE DIAL IS ON THE BACK ON THE CAMCORDER AND IS USED TO ADJUST MENU FUNCTIONS AND EXPOSURE SETTINGS.....CAN ANYBODY POINT ME IN THE RIGHT DIRECTION TO FIND THIS PART????ANY HELP IS APPRECIATED.

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