Well as others have reported I lost the bolt on my rotary mower last night and the blade came off. I have used that mower for six years and never had a problem. Always lube it and check the bolts, etc. About a year ago I tryed for all I was worth to get the blades off and couldn't even budge them. I wanted to sharped them but figured oh well it will wait. Well don't have to wait anymore now!!!