Does it matter if ks-30 switch is installed with brass contacts in hot side (cord with print on it) or neutral (cord without print)?http://www.zingear.com/UpLoadFiles/Large3/2010072206094178.jpg

Any single pole cord switch must switch the hot. The hot of a 2 wire cord will not have markings identifying it as the neutral, which can have ribs, slashes, or some sort of permanent marking in the insulation.