So there I am walking along at normal rate and I hear a metal clicking coming from inside the engine assembly of my less than a year old Craftsman 7.0hp push mower. I turn it off. I had hit nothing but normal grass. Upon inspection the blade won't budge. Neither will the cord pull even an half an inch. Turn it sideways and can't move the blade AT ALL by hand in either direction. Took a hammer to the blade to turn it backwards. Yeah, it would move a quarter inch every blow. Did that 3 times then came to my senses. Removed the sparkplug. No sign of oil there. There's nothing in the blade housing impeding its turning. Aaarggh. Any thoughts are appreciated.