GLEN - On your Uncle's 50 inch deck there must be something wrong, I think possibly the wrong blades. Something for a narrower deck. I can see missing a few blades of grass on turns but to mow straight and leave two strips of uncut grass should be impossible.
I'd suggest he take the deck OFF and lay it down side UP and inspect it closely. And if he needs blades order them from Charlie, then you KNOW you'll get the right blades.
I'd suggest he take the deck OFF and lay it down side UP and inspect it closely. And if he needs blades order them from Charlie, then you KNOW you'll get the right blades.