My neighbor asked me how to wind the line on his Weed Eater brand trimmer since he didn't know how. I opened the head, and on the spool there was a disc in the center that ran around the spool where the line is threaded. It's a partition for the line so it can't cross over itself in the head no matter how poorly it is wound. The center of the line gets hooked on a groove in the divider, and the spool is wound with 1 part of the string on the top and 1 part on the bottom of the divider. I haven't seen anything like this before--neat idea. I have an echo and a red max and neither have this idiot proof feature ( I wish they did so the summer help could wind line that wouldn't jam up). I was thinking about making a divider to try it out. Has anyone seen this before ?