An elongation measuring device 10 measures an elongation in a timing belt 4 included in a driving device 1 provided with a drive roller 2. The device also includes a heat control unit that allows a user to select the amount heat delivered to the grill. Thus, when the lower pipe engagement assembly is actuated to securely hold a pipe segment, the top drive assembly may be actuated to rotate the top drive output shaft, which causes the lower drive shaft and lower pipe engagement assembly to rotate, which in turn rotates the pipe segment.