We have a hobby caravan Bj89 and wanted to build a new antishlinger coupling, now I have found that the Winterhoff WS 3000 does not fit. Unfortunately it is in the description that you should use the M12 screws or with M14 screws the holes bore, now the screws are installed but M19. Does someone advice or fits or can not install antishlinger coupling because the screws are too big. Thank you