Pumping system comprising: a progressive cavity pump comprising a helical
rotor inside a helical cavity of an outer stator; motor for driving the
rotor, with a motor shaft coaxial to the axis of the stator cavity; and
an intermediate shaft coupled, at its ends, by respective couplings, to
the rotor shaft and to the motor shaft. Two devices consisting of two of
these connected parts are constructed as a male device terminated by an
axial stub and a female device terminated by an axial housing receiving
the stub, at least two radial screws, not aligned, one of which is a
cone-point set screw, connected the stub to the female device.