Yeah I was jsut basically tightening the bolt on the bottom of the blade. I guess you use a pair of vise grips or something to hold the shaft and then tighten the blade bolt on the bottom. I was not sure if I had to take the top cover off to access the top and hold it there. I guess it can come loose after a certain amount of use. I even when to black and deckers site. YOu would think they would at least have the user manuals for thre products up ther ein .pdf or something but nothing................. How hard is it to do that