The main hole for the concealed hinge can be made by drilling a dozen or so smaller holes, with sides touching the traced circle. It is necessary to ensure blind drilling to a sufficient depth slightly greater than the thickness of the can itself. After drilling the holes, the remaining material inside the coil can be easily removed with a narrow and sharp chisel. Before we align the sides of the hole and its bottom. If such a hole turns out to be too large, glue the hinge cup with two-component glue.
