I have a four year old lazer z hp with 48 inch deck. Awesome machine until the end of last season when I started noticing a skip or strip of uncut grass between where the blades overlap. I took it to the local dealer and they pronounced it fixed (minor adjustment to deck they said). As it was the end of the season and I had no grass to try it out in, I went along with them. Here we are and the same problem remains so I took it to a local repair shop to see if they could fix it. The first thing he did was measure the blades...16 1/8 from end to end. I think they need to be 16 1/4. The only way I get 16 1/4 is if you measure them diagonally like you would a tv. How do you measure the blades? I have purchased all my blades from an exmark dealer. surely they didn't sell me the wrong size. Help.