Instruct: Classify a given review into positive or negative sentiment.
Query: Doesn't install on all trimmers it says it does...

The Grass Gator was supposed to end my nightmares with my string trimmer. Left Amazon and double checked this product would work for my specific trimmer. It stated it did. However, after getting my trimmer all set up for the install (taking of guard, old spool, etc) we found out it does NOT. So now I have a brand new Grass Gator, as well as both light and heavy duty blades and they're useless to me. SO disappointed.