Hello, I hope this isn't too much of a foolish newbie question but I'm trying to figure out how to apply the Marklin plastic isolator clips. There appears to be a wealth of 'how to' online but not for this. I can see easily how it can be applied to the non fishplate rail but to the one with the fishplate? Does the fishplate need to be removed or does the clip fit between the fishplate and the next rail without any alteration to the standard track. Thanks in advance for any informed responses.