This is a remix of Stigern's 0.25" Z-axis shim for the FF Creator Pro.
I'd gotten a 5mm glass bed from my local supplier, so I remixed it to come up with a 5mm version of my own. While I was at it, I also did a 3mm version.
Just pop in it behind the Flashforge logo plate and you're good to go!
Don't forget to mount this shim in before installing the glass plate.