Hello! I am confused about how to put new line into my line trimmer. I have watched youtube videos and am getting mixed info on whether I have to pull an outer cap off the head to re-thread line, or just line up the arrows and push cord through? All of the initial line has gone as far as I can tell. The manual doesn’t make it as clear as what I would like either 🙁 The bump cap is yellow if that helps. Thank you