The invention concerns an assembly for producing a vehicle windscreen wiping system (10), including an end fitting (14) of a wiper arm (12) adapted to move a wiper (16), a connection interface (50), and an intermediate part (40) called clamp, said assembly being adapted to occupy a working position in which said interface (50) is free relative to said end fitting (14) and a so-called service position in which said interface (50) is retained in an oriented manner inside said end fitting (14) by said clamp (40).The invention also relates to a connection device for a vehicle windscreen wiping system (10) comprising such an assembly as well as a vehicle windscreen wiping system (10) comprising a wiper (16), a wiper arm (12) and such a connection device.