SELP techniques that provide an accurate estimate of the length of a transmission medium are disclosed. Flow of water through the conduit providing ozone from the ozone generator is precluded by the check valve establishing a pressure environment within the conduit to prevent the flow of water from reaching the ozone generator. Etch processing is then used to position the layers and at locations within the inlaid structure depth that result in one or more of reduced DC leakage current, improved optical performance, higher frequency of operation, reduced cross talk, increased flexibility of design, or like improvements. A method for fastening at least one cutting insert to the parent body includes fitting the parent body with the cutting insert ; arranging the parent body in a jig ; bringing the cutting insert into a desired position; and clamping the cutting insert in the desired position. These strips secure to ferric material strip extending along each side rail of the free-standing or wall-mountable mirror frame support embodiment.