How important are expertise and flexibility in finding effective technical solutions?   Let's find out how it was possible to solve a critical application problem to the rotary joint of a workhead spindle   Thanks to the expertise and competence of Johnson-Fluiten engineers, an effective solution was developed for a major company that was complaining of continuous problems with the rotary joint used in the workpiece spindle of their new machine tool.     The context The company is a solid historical entity that has been producing a wide range of machine tools for about 50 years, its main field of activity is finishing and surface processing of