1937 Rover 12 - Wiper Arms

[AFPU]

The wiper arms on my 1937 Rover 12 when parked currently point towards the nearside (passenger side), i.e. both in the same direction. In fitting new wiper arms I tried to remedy this so that they park, as I believe they should, i.e. both pointing away from the centre of the car......but to no avail. So is there a need to adjust something within the wiper motor?