I have a Ryobi 4 cycle power unit (X430 - upgraded from original I had since the mid-90s). I have 4 of the Expand-It attachments, including the string trimmer. The trimmer line finally ran out after years of residential service. I finally found a YT video from 2014 that showed how to rewind new string onto a 132r trimmer head, without removing or replacing the entire spool… or worse: replacing the entire head with a different style (one with easy winding). I made the video so I won’t forget how easy this chore is to do, when the line runs out again in 5 years or so. The whole job takes about 5 minutes.