RandyT
Elite Member
I will try to explain what is going on. When you mower you pick up debris, IE, dust, sand, rocks. The air flowing over the air lift tends to get more dirt abrasion right where the blade is bent to create the lift. this sandblasting slowly cuts the blade at that point, until it basically cuts the air lifts off the blade. Blades from years ago didn't seem to have this problem like todays blades, so I don't know if they are just softer, or a different material.