An apparatus for aligning and dispensing a plurality of solder columns in an array. Additionally, an unlock pushing portion of a slider, having reached an initial mount position, enters a deformation space for a lock arm to prevent resilient displacement of the lock arm. An article may be coated with a thermoset thermoplastic, or radiation curable powder, which may be applied by electrostatic spray or fluidized bed or by thermal or flame spray. In addition, since the spring compression mechanism and so on can be attached to the valve element driving part without any alternation of the valve element driving part, the spring compression mechanism can be shared by two or more motor-operated valves, and reduction of expense for a diagnosis of a motor-operated valve and improvement in accuracy of diagnosis can be achieved. This invention will be particularly useful to detect substances selected from the group consisting of explosives and narcotics using nitrogen NQR.