How the hell do you get the rear washer jet off? I've managed to remove the wiper arm, the motor and all the other little bits but just can't get the actual jet part off the little pole connected to the motor. There seems to be some kind of screw or something at the end but I just can't turn it. Likewise the jet won't budge so can't even slide it off.

Be grateful if anyone can help as the bit to adjust the trajectory is knackered so have bought a new replacement part from ebay, just need to be able to get the old one off first!!

Jamie