Disclaimer: I am just an average joe with average problems. Please consult with your Echo SRM 225 manual to replace Trimmer Line. I accept no liability.

Note: Once you have the correct rotation or Spool head direction, you never have to open the butt head unless string is stuck or when debris gets inside.
Remember to subscribe and support my channel

Trimmer Line as shown in video:
https://amzn.to/3Qzc8Wm

Donations: https://bit.ly/2HztYIH