Question about Shure SM81LC Professional Microphone

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Oops. took apart my sm81 condenser microphone

this is the best illustration i can find showing a typical diaphragm/backplate - apparently it's the capacitor or condenser assembly. there's very delicate spacer/washer(?) between the diaphragm and the backplate, shown in the picture but not labelled. i noticed that one side is shiny. does anyone know what it does (insulation?) and whether it matters which way round it goes.

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