Just bought a couple of N scale ConCor bay window cabooses. I would like to install MicroTrain couplers. My problem is this: The factory rapido couplers are installed in boxes that are part of the cast metal frame. I see no way (short of grinding the boxes off) of removing the stock couplers. Am I missing something? Has anyone out there had any expierence with installing MT couplers on said ConCor cabooses? Thanks and Happy New Year!!