A method of predicting whether a subject is predisposed to developing early-onset menopause is provided. The string binder comprises a fibrous substrate with a chemical treatment, applied thereto, comprising an epoxy film former, a curing agent, a thickener, and water. With this configuration, machining of a bellows fitting unit provided in an end-plate cone portion can be performed in existing facilities such as a factory, in a state that the lower block and the middle block are assembled without assembling the upper block. Further, the invention relates to a loading platform for carrying out the method. Further, a pair of magnets is positioned between the solenoid coils and the housing to provide magnetic flux to maintain the contactor in an electrically closed position. The control circuitry may provide digital image data to the storage and processing circuitry over additional vertical conductive interconnects coupled between the control circuitry and the storage and processing circuitry.