dryer was not drying , and was shutting off

well guys replacing the knob was no big deal, but i initially thought that the timer was bad. i jumped the gun and ordered the timer on a wednesday and discovered on thursday upon further investagation that the back of the dial shaft was cracked creating the whole problem, so i ordered that and everything is fine once installed (& the timer is on the way back). my advice is check thoroughly and order once, you get less laughter from your wife on this one. thanx mcsgt(robert)