A method for reworking a connector attached to an electronic board and including a plurality of stacked modules thereon. The opposed first and second rotor slot sidewalls are formed using a cutting tool having a first rotational axis oriented at a first angle outwardly diverging from the radial axis and with a second cutting tool having a second rotational axis oriented at a second angle outwardly diverging from the radial axis that is opposed from the first angle. The multithreaded processor processes a plurality of threads via a plurality of processor pipelines. The method also includes downloading the fine correction bias voltages to the thermal camera and applying the fine correction voltages to the detector elements to establish a fine calibration of the microbolometer focal plane array. The focus lens unit and the final lens unit are disposed so as to be adjacent to each other, each lens unit moves so that a distance between adjacent lens units changes in zooming, and a focal length of the final lens unit fimg, a focal length of the focus lens unit ff, and a focal length of an entire system at a wide-angle end fw are appropriately set.