[Andreaz]

Don't worry about the tops of the forks, the bottoms are the important part. Insert the axle without the wheel and if you can turn it easily, they are right. If not, very slightly move one leg up or down until you can.

I do not agree. The forks should be aligned so that they are at equal hight. If the axle can turn easily does not matter. Fork hight explained by Traxxion Dynamics, look at 9 minutes out in the video.