I grew up in that simpler time when reel type lawnmowers were common and I don't recall hear of anybody that actually had one sharpened successfully. There were a lot of people that had their mowers sharpened in the winter and the lawn would look great for about the first two mowings. After that, they looked and pushed about the same way they did at the end of the previous summer. The sharpening cost about the same as a new mower. But life was simpler then--you just went out and bought a new mower when they got really hard to push and gave the old one to the scrap metal drive or bought a goat.