Hi Battery mower. Thank you for your feedback. The previous link was provided as a reference if needed. With the photos provided, one of the knobs needs to be reversed. The protruding bit from the knob should be facing inwards towards to the unit. Should you require any further assistant, please contact us directly at 1-888-909-6757 (1-888-90WORKS) to speak with an agent or start a chat and we will be happy to assist. Thank you for continuing to choose Greenworks Tools!

Hello Bob89.
We are glad to hear you are getting strong power and runtime from your 24V 12" String Trimmer/Edger, but we are sorry the line feed performance has been frustrating, that is certainly not the experience we want you to have.
Line feeding issues like you described are often related to spool setup or line advancement technique. This model uses an automatic/bump feed system, and for best results:
1. Make sure the spool is properly installed and the line is evenly wound (not crossed or too tight).
2. While trimming, lightly “bump” the head on the ground while the unit is running at full speed to advance the line.
3. Avoid letting the line get too short before feeding, as very short ends can sometimes prevent proper advancement.
4. Check that the correct line diameter is being used, as oversized or undersized line can affect feeding performance.
If the line is consistently not advancing even with proper use, the spool or feed mechanism may need inspection or replacement. Our support team would be happy to help troubleshoot further and ensure everything is functioning as intended. They can be reached either using the online chat function, on Greenworks Tools page, accessible by clicking “Chat Now” in the bottom corner of your screen, Chat with a Live Agent or by calling 1-888-909-6757. So, our experts can discuss your experience; please have your unit, battery and charger with you along with the model and serial number to complete troubleshooting to ensure quick resolution is provided.