How do I adjust the roof mounts?

I don't know the proper name for these so it's about impossible to do a search.

Anyway.......mine dont line up very well and I'd like to adjust them, if I knew how. I see some hard rubber on the inside of them but dont want to just start pulling. Bentley doesn't help on this.

Also my clamshell cover could use some slight adjustment, if anyone has words of advice I'd appreciate them.

When the top is down the clamshell is just slightly higher in the center rear then when there is no roof under it. The leading edges need a slight tweak here and there.

When the clamshell is in the up position there is a small slider exposed. Move this back or forward to set the level of the clamshell lip when it's in the closed position.