The back plate is very stable / solid. Unfortunately, one of the two pressure areas has been poured slightly crooked, so that you could tilt the brake pistons when pushing back. Add to this that the lead is not optimal results. So the surface tilts away when you press again, which enhances the effect of tilting.
Still do not know whether I should risk a use of the tool, or let me first send replacement. Do not forcibly return any dishes have this problem.
