Saturday morning I had sharpened the blades on my Super Z. Installed blades and decided to scrape exess grass from under deck. Hand slipped and hit blade at 45 degree angle. Severed main artary in hand and cut pointer finger tenden in half. We live 20 minutes from town, had to drive to hospital with lots of pressure on cut, lost massive amounts on the way, blood pressure was 62 over 40. Guys please pay attention and think about what you;re doing before you do it. I have grown up on the same farm my entire life with tons of John Deere tractors, balers, combines,cattle & horses etc.. This was the simplest thing I have done in years, with the worst result. I didnt think, was home alone, had on no gloves, and should have cleaned out deck before I installed blades. BE SAFE & THINK BEFORE YOU ACT !!!!!!!!!!!!!!!!!!!