I acquired an old Crane Coal stoker a few years ago and recently installed it. I notice that the end-plates (part 437) were not installed. I have the parts, but it seems that I need to remove the firepot before installing the end-plates. I've tried spraying with PB Blaster and tapping with a hammer, but haven't been able to get the firepot to budge. Does anyone have any tips for removing a stuck firepot? or have tips on installing the end-plates?