FSA 56 Stihl Battery operated weed wacker

[DomM]

Hi, Does anyone have information on how to replace the head for the above-mentioned stihl product?

 

[BlazNT]

This is how you change the string trimmer line.
https://www.youtube.com/watch?v=vvGJ9uBsRH0
Bolt in the center of the head is left hand tread.