Is the aerator locked down or do you still have it up?I need help. I bought a Ryan Lawnaire V aerator 2006. In great shape. Engine runs fine. Aerator moves great and the tines roll well. It will not leave plugs. I have sharpened the tines, I have cleaned the tines with a brush. It weights penalty and I even filled the roller with water plus put a 40 pound bag of sand on the aerator and still no plugs. I have some photos. Please advise. Thanks in advance.