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I just did this job on my 18cc Weed Eater today. Big line is return to tank, little is in to carb line. A tiny bit of Vaseline on the line helps it feed better through the tank holes. Wipe it off...

Push the line through the hole in spool. Tie a half hitch in it. Heat knot with some flame to melt a little and relieve it's stress. Trim tail off knot and pull it tight to the spool. Wind the line...