The present invention provides compounds that are glycine transporter 1 inhibitors and are therefore useful for the treatment of diseases treatable by inhibition of GlyT1 such as cognitive disorders associated with Schizophrenia, ADHD, MCI, and the like. The methods include assembling a stack of electrodes, monitoring voltage of the stack during the assembling, and identifying defective electrodes based on the voltage monitoring. The carrier portions have cross-section dimensions set to be smaller than those of the molded housing and have flexibility. At least two longitudinal ribs oriented in a longitudinal direction of the container are arranged between each pair of recessed grips. The inner radially facing surface is structured to reduce the thickness of the lens.