71374 Mechanism advice

[Skinny Boy]

Hello Eurobricks. First time in the technic forum so go easy on me, this is a bit tricky to explain.

I am building a large screen which uses the same mechanism (treads with plates/tiles attached rotating around) from the Nintendo Entertainment System set, #71374. Mine is on a bigger scale but otherwise I copied the instructions very closely. I should note I don't own the set so I can only see it online for reference. After getting most of the mechanism in place and testing it I noticed the panels (tiles and plates which move along the treads) tend to wobble, as in they shift slightly up and down. I can't see any obvious reason for this but I am guessing the larger scale means the treads lose some tension over distance.

Anyway, I figured instead of sulking I might actually flip the whole mechanism 90 degrees so the screen would now flow up and down, like credits after a movie. But that leaves me without a guide to follow, so that is why I am here. Has anyone used this mechanism flipped 90 degrees? I don't really know how to search for models featuring it. I am low on the pieces required, so it would involve dismantling my current setup in order to test the new one.

If anyone knows what I am talking about (good luck) and has any suggestions/advice (I don't have any photos as this project was meant to be kept secret as long as possible) please post something, anything.

Thank you.

[LegoTT]

If you are low on pieces, maybe you don't have what it need to build an adjustable track tension mechanism like on the #41231 set.

https://www.lego.com/fr-fr/service/buildinginstructions/42131

I think it will do fine verticaly.

 

But maybe it is not lost horizontaly, if #71374 doesn't use guides you can add them with whatever piece, put plates just below the chain so it will slide on it all the way because it support it.

If not enough add supports in front and at the back of the visible part of the track, so the section of what you added form a "U".

A such long support at the bottom, a long support at the top, with no slack so the tracks can't hang.

I think it will be fine like this. 

As whatever plate is good for that, you can get cheap on the wall in an official legostore, if you need specific pieces, majority of lego pieces are 0.2$ on bricklink.com