I am still assuming, but the links to the swash plate are metal rods with plastic ends, which can be screwed more or less onto the rod... Or then you can adjust the rods from the servos to the controls. Either way, those rods are what adjust it.

Before you go adjusting it though, you should check that it is a problem (as in you can see that its not perpendicular to the main shaft). If its not a problem then just practice more.