Does anyone use kadees on their European freight wagons. I've been trying out the Kadee 5 on my Russian wagons but even if I set the box out proud from the wagon end the buffers lock on corners. I remember reading somewhere that I should use a longer shanked variety - but which? Another article mentions the No.16 and yet another recommends the 40 series. Advice please. I have two sorts of wagon a standard 4 wheeler and some US 40' wagons with buffers attached. Help!