Offset between tool and endstop

[nraynaud]

I have a tool whose offset is not zero on the Z axis wrt the endstops.

I have to bring the tool away from the plate in X/Y, home Z, then apply the tool offset to have Z be at the real value. Basically the tip of the tool is fouling the bed when the Z stops click.
There are no screws on my Z stops

I don't know how to do that, using G1 H1 sets the Z axis to zero, whatever the current tool offset is defined to. and I don't know how to read the current tool offset to use it in G92.

thank you for your help.

edit: I am using RRF 3.0beta12