I managed to run this ... the good news it that there are no leakings betwean spindle and the ring , and the bad news is : my coolant pump has insufficient pressure
I closed 2 coolant nozzles because by changing tools my hand was too wet , I added a cooper nozzles and that helps to lead the coolant at the tool. Now I need to find a pump that has 1.5-2 bar pressure, mine has only 0,45bar max.