Fabia fan control knob bust?

Hi guys,

Not sure what I've done here but I recently took the trim panel around the heater control knobs off and then removed the light guide and knobs. Now, having reassembled it all the fan knob seems to be up the spout!

It works the fan OK but will not stay in the number 1 position (it seems to want to go to a position in between the detents for no 1 and 2 and only lines up with the marks at potion 3 and 4!

Ha anybody any ideas on this as I've now tried at least four times to sort it and I know the knob is on OK and everything seems to be in position. It's almost as if the contacts behind the knob at postions 1 and 2 should be recessed but aren't.

Cheers