I've just bought a N&W J 4-8-4 in N scale and the tender coupler is to low. The coupler is body mounted so I see no way to adjust it. I've looked at the diagram and don't see any shims between the tender truck mount and the body. I don't want to put shims there anyway because that may interfer with tender electrical pick up. Is this a problem with all of these units or is mine unique? What can I do short of sending it back to Bachmann and not seeing it for three months. Please help, thanks, Mark