A coil spring 213 is sandwiched between a coil spring adjoining wall 202a of the female plug shell 202 and the edge of the large ring of the slide sleeve 203 and is held inside of the slide cover 215 in which the coil spring 213 can expand and contract freely. The turnbuckle anchors comprise a plate incorporating housing for releasably receiving a turnbuckle eyelet and a blade extending from the base having a substantially triangular shape. The beams are returned to a non-polarization beam splitter, transmitted through a quarter wavelength plate and converted into one straight polarized beam having a polarization direction varying with the phase difference between the two beams. The value of the current varies based on a resistance value of the particular MTJ core.