Sorry, don't understand. That is precisely the effect I want to achieve, lower the nozze tip under the theoretical zero coordinate (remember the printer card works on theoretical spatial positions).
Printer homes z-axis with the help of either the axis end switch, or in my case the BlTouch reported "touch" position ... that hapens to be 2.05mm BELOW the nozzle. That distance depends only on the support adapter where the BLT is mounted.