RT - How to Adjust the Cutting Height on the RT?

The RT has a small height changing knob on the right side of body. The knob has lines on it, from four lines to one line. Push the knob in and turn to desired height (four lines is the highest cut): 

Four lines  60 mm (2.4 Inch) 

Three lines 45 mm (1.8 Inch) 

Two lines  30 mm (1.2 Inch) 

One line  15 mm (0.6 Inch)