While refinishing the deck (covered in a previous post) I noticed the mandrels where ruined at the blade attachment. The star shaped key was rounded off beyond repair so I had no choice but to replace the mandrel completely which I had no problem with. These are the parts that hold on your blades and keep them away from you, I would hate for one to break loose and who knows what kind of damage it could cause. Another nice benefit of the new mandrels is brand new bearing which will keep the blades spinning with minimal resistance. I received another misc. goodies package from Sears in the mail and I bought a package of E-Clip retainers to replace all of the old rusted / missing clips. I bought the new clips at Harbor Freight for a fraction of the price sears wanted.