I wonder why they can't just use a toothed belt.
Because you'd have teeth rubbing out all through the course, which would eat them through very quickly, or you'd have to add toothed rollers throughout the course which would increase complexity tremendously.
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Because you'd have teeth rubbing out all through the course, which would eat them through very quickly, or you'd have to add toothed rollers throughout the course which would increase complexity tremendously.