I am trying to replace the pull cord on my trimmer, but to access the the assembly, I have to remove the clutch to remove the plastic shroud. I removed the clutch cover using a narrow tipped screw driver, but I'm not sure if the clutch assembly is pressed on the shaft or threaded. On the clutch is written the word "off" with a directional arrow. I tried loossening it, but I didn't want to force it becase I wasn't sure if it was threaded or not. If anyone else had to break it down past that stage, please give a shout-out