production tubing 76 fig4 the engaging base 30 includes a coupling 28 on its lower end configured to mate with an intake coupling not shown disposed on the tubing 76 a lower flex shaft housing 32 connects to the engaging base 30 on an end opposite the coupling 28 as shown the lower flex shaft housing 32 is a generally tubular member having apertures on its outer surface configured to receive wellbore production fluid for delivery to the pump section 38 a mandrel assembly 34 coaxially connects the lower flex shaft housing 32 to the upper flex shaft housing 36 a flex shaft 31 is shown provided within the pumping system 24 extending from the lower to the upper flex shaft housing 32 36 the pump section 38 of fig2 comprises a progressing cavity pump having a rotor 40 and a stator 42 the rotor 40 outer dimensions correspond in shape and profile to the stator 42 the rotor 40 which preferably comprises metal has an exterior helical configuration and splined lower end the rotor 40 is configured to rotate within the stator 42 wherein the stator 42 is preferably formed from an elastomeric material the stator 42 is shown having double helical cavities located along its axis through which the rotor 40 rotates rotation of the rotor 40 therefore progressively urges production fluid axially up within the housing 39.