Set the cover plate into place and make sure it’s tight to the stone, without large gaps. If it’s a good fit, screw it onto the outlet.
Since the surface of the stone is too irregular for mounting the outlet and cover plate, the first step is to carve away the stone to create a flat mounting surface. This isn’t as difficult as it sounds, because the area you need to flatten extends only about 10mm beyond the hole in the stone.
First, make sure the power is still turned off. Then, start by temporarily connecting the outlet to the box using the long screws included with the box extension. Set the cover plate over the outlet, making sure it’s level, and trace around it. Now remove the screws that hold the outlet to the box and move the outlet of the way. We used a rotary tool with a diamond wheel attachment to cut the stone, and an old wood chisel to square up the corners. You could also use a 3mm glass-cutting drill bit mounted in a drill to chisel away the stone.
Start by cutting the outline of the cover plate. Then cut away protruding stone inside the line until you have a flat surface for the cover plate. Then simply reattach the device, along with the new box extension. Finish up by installing the cover plate.
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Source: Family Handyman
