If you are using an E3D v6 Lite on your stock i3 Rework the Z endstop bracket might not be tall enough. An E3D v6 Lite is about 5 mm longer than a stock JHead. I used Meshmixer to extend the the height of the bracket. All other dims are the same. It is also compatabile with non Lite E3D v6 assemblies.
File is available in STL here [
www.youmagine.com]