Details: If you're like most Technic builders, you've noticed that none of the tread parts work particularly well as conveyer belts. They look great, actually - the problem is that it's just not practical when you want a machine to really work. This model gets around that problem by using dark grey pegs (which have half-brick length on one side, allowing them to snap into treads easily). The builder provided instructions for this GBC, too, so if you wanted directions to make your own, there you have it. Of course, I'm pretty sure the exact type of treads being used here are a fairly new part...
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