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@Oswald
At the time even the likes of Merckx used drillium parts. FEA sorta put an end to drillium anyway .. although you could contest that some parts are still overbuilt to suit cost. Need proof look at the Sram Rival vs Red rear derailleur side by side. They are near indentical apart from the materials used and some further detail machining on the Red, so the Rival is overbuilt to a cost point.