I used Chainfire's CF-Auto Root to unlock/root my Nexus5 (no custom recovery) with my linux machine. I would like to go back to stock because I'm taking the phone in to get fixed next week. I've searched guides all over the internet, yet not one has actually worked for me.
I really don't want to have to use a "Toolkit"
If anyone has done this, or knows of something I missed please let me know.