The red one has lugs on it so it can't turn,also it has no screw driver slot.The white one only turns about half way.I have tried that in various positions and it seems to make very little (if any) difference.
You need to rempove the plastic covers to be able to be able to adjust the screws.
Regards,
Bruce
Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.