The plastic coating on the holder is only a wound foil you can preview (analogous to a screen protector when mobile). The course must be from before installation! Thus, when I am not been hakelig the assembly of the holder and the adjustment. Simply loosen the screw holder and you can move the bracket with LNB on the rail. The holder itself must, by design, are of course not fixed "slammed" with the screw. It is enough a simple, easy to put on the screwdriver and the holder together with LNB is secure enough.
The annexed guide is very good and nicely illustrated with drawings (mounting positions at different LNB combinations).
I prefer a star off because the material is not trimmed as neatly as I would have expected at this price.