Hey guys, newbie here, searched through all of youtube and on this site - I am having issues adjusting the height control knob on my zero turn mowers (2 of them to be exact). I have put my foot on the deck pedal and have it all the way up, I cannot for the life of me turn the height adjustment knob at all, I have read somewhere that it only goes clockwise. I have searched the operators manual throughly and cannot locate any info on this. PLEASE ASSIST!!