I use a braided trimmer line with "nerve" because I cut thick reeds and tall grass. On my second trimmer line replacement, I lost the Allen wrench that holds the pieces of the trimmer line together, and before that, the pieces of the trimmer line would easily break in the middle due to the pressure-tightening of the Allen wrench. I tried using a hexagonal screw from the market with a groove, but it would cut the trimmer line, so I got tired of it and scrapped it. The advantage is the small weight and volume that help the machine.