Schaublin 52 & 53 milling machine coolant nozzle clamp director, comes as part of standard issue when new but can go missing over the years. The body of this attachment clamps to one of the two extended  support arms (50mm diameter) for the head, and simultaneously clamps the coolant nozzle (18mm max diameter) directing it wherever you choose before tightening (nozzle clamp swivels). All good.  Winner to pay within 24 hours.