Several years ago had a customer with a JD LX176 that over time the sand actually cut the bottom inch of his deck off.Around here, with soooo much sand, the back edge of blades get razor sharp.
I'm gonna start stocking low lift blades.
At least for customers who have a lot of bare spots to mow.
Get you some sanding disks, instead of the grinding blades. My son, who's a welder, calls them tiger disks. I use about a medium grade disk.I just used them until they got dull, then bought a new one (I actually have 3 blades total). I saw a YouTube video with blades in similar shape, and they used an angle grinder to sharpen them. Critical part I learned is to balance them, which is also appears easy. I bought an angle grinder from Harbor Freight tools yesterday, so I'm going to give it a try. The underside of the mower looks like it good use a good cleaning too. Another thing to add to my to-do list, (sigh).