The mount is designed for a single illuminated push button (see https://eckstein-shop.de/QITARuggedMetalPushbuttonwithBlueLEDRing-16mmBlueMomentary ) and contains an overhang to place it behind a wall-mounted shelf (so that it cannot move around). The button sits rather tightly so the counter nut is not needed. FreeCAD model files included for easier adaptation.