By using this Spring Jig Adjuster, you can align the springs and the armature bar right in the middle by putting the armature bar in the jig. It takes less than 5 seconds to align! This special tool is double sided, so it can be used for both 10mm and 12mm armature bars. In addition, you can bend the springs the right way using the side of the jig. For fine and easy adjustments for your coil machine, this is the tool you need!