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@cookiesdonniedarko
Not really ... stop being an idiot.
All material stretch over time include metals (in fact nothing is completely solid, put brass and iron in contact and they will flow into one another .. over hundreds of years) .... Belts can be bloody strong, all the force is along the belt .... just optimise the material to suit the stress/strain properties which are needed..... what is so hard to understand about this shit?