MEG MOb blades
You do not not take the knives of the disc to sharpen . I am dot lazey but we use the best lock nut that we can buy and also put red lock tite on the them. Do not take the knives off until you wear them out. The blades are balance when running wether you want to think so or not. Centrifugal force does it just the same as what most truck wheels are balance by. I use centrifugal balance on all my cars and trucks also. Some one said they had vibration on there mower. You may have a spindle bent and if there is one of our blades out of balance call us and we do fix that.