The Azimuth Arm is a movable part of the heliostat and turns the mirror left and right. It is attached to the azimuth servo in front of the heliostat. This connection is also its turning axis and (later) the center of gravity of the azimuth arm; once the mirror in front and the elevation servo at the back are mounted.  Construction: Cut out a block of 20cm by 10cm with a thickness of 2cm.