I need to take a Weaver mechanical reefer apart so to adjust the sound pot (turn it down!). I had seen this either posted here or in the magazine years ago and actually did it. I recently acquired another one of these cars recently and realized that I had forgot how to do it. I don't want to force it apart and break something. Does anyone know the trick? Why they put a volume pot on it without easy access and no instructions is beyond me!