I am pretty much stuck with this Ego trimmer and the previous trimmer head and this newer version are junk.
The way the string wraps causes it to tighten into the wound string in the trimmer head and get stuck in/on itself thereby keeping it from feeding.
Maybe if tech support ever answered the phones they could tell me something that I am missing, but I only have so much time to wait on hold.
My next trimmer will not be an Ego.
BUYER BEWARE!