How to offset "Z" in Cura - Below build plate, ie - 0.9mm

[Anet8 0]

Hi, I am wanting to print an model and the model requires a wee tweek as in, it needs to be 0.9mm below build plate. Thus when printed, it will have flat / smooth face, eliminating a small raised peace. This is so i can mount a stepper motor flush. I'm using Cura 4.4. 

Any help will be appreciated.

[ahoeben 1,986]

Click on the model

In the move tool, enter -0.9 in the Z coordinate box.