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Here you can see how the switches and contact plates differ from the fluted headlights and the Twolite lamps, with the top picture being the later style Twolite system. The top right cover is the longer cover used in 1930-1. You can see two styles of contact plates used with the Twolite switches, with the one of the right with 9 brass contacts being the more common one by far.
BTW, for those wondering how the Caswell copy cad plating system looks, these are parts I plated using my Caswell kit.