Hello all I hit a stump that was covered by leaves, I knew it was there but I had one of those moments anyway after I hit it had a vibration in the mower deck cut the pto off no vibration with pto on vibration back. I took the deck off and examined the blades and I cant see any bend but one of the blades does have a little more shine in a small part. Cant see any bend when spinning. Just wonder if even a small bend could cause the vibration , it is an L130 with 48 inch deck Also to my eye when I put the blades on top of one another I cant really see any real difference. Thanks for any help. The stump was an old dogwood stump pretty tough.