Provided is a taste improver that improves or decreases unpleasant bitterness, astringent taste, harsh taste, bitter taste, or the like that results from potassium salts, magnesium salts, calcium salts, and ammonium salts without adversely affecting savoriness of a food or drink. The interconnection generally operates to secure a fiber in one end and communicate a signal received from the fiber to a device attached thereto. 7, and wherein: Ro550 is 115 to 160 nm; \u0394Ro is 3 to 30 nm; each of \u0394Rc, \u0394Ra, and Rc and Ra at a wavelength of 550 nm is equal to or greater than 0; a retardation share ratio of Ra550 to Ro550 is 10 to 80; and a wavelength-dispersion share ratio of \u0394Ra to \u0394Ro is 0 to 80. Like regions of at least two edge maps are compared for distinguishing displacement of a landmark between the at least two edge maps. Once assembled, the putter can be used by a golfer as they would any current putter. The mounting is achieved using a sliding guide on a guide plate, coupled to the container.