Oh, I forgot - you have a mix of new and used track from different manufacturing runs - when they don't snap together or they are too loose - just use another piece with that track - it is easier that way - if it is too tight and that is the only track that you have on hand turn one piece around and try the opposite end - when they are too loose a completed loop will keep them together or you can use a mini-binder clip underneath to hold them together
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