You must put it in the middle for the chain lift because otherwise the chain would get caught on the knobs in the middle of each green track piece. As for the rest of the track, you don't necessarily have to put the middle tubing on. I built the Screamin' Serpent without the middle piece and it worked fine. The middle tubing is more to reduce friction and have a more steady ride. If you have enough tubing, use it. If you don't, then you're still OK. Hope this Helps!
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Thanks for that help since I might I get like 5 sets of the screamin serpeant set at the begining of summer.
Post pictures of it if you want! Just tell me!
Sure but it's like a month and I signed up for sscoaster.com so I might post it on there.