Peugeot 206LX 2002 Indicator switch fault?

My Peugeot 206 LX 2002 has a problem with its indicator switch.
It used to be very fluffy and unpositive in its action and often when turning right it would cancel and go too far and start indicating left.
A breakers yard replaced the 'comms' unit and it feels like a new one but I cannot get it to cancel correctly.
I think that it is to do with the angular position of the steering wheel on the collumn.
The wheel was removed to replace the 'comms' unit.
I have tried moving the wheel round one spline at a time but I cannot seem to find a position which works for all turns.
Is there a secret in positioning it?