Which 'finisher' are you referring to? If you are talking about the front to back aluminum strips that the roof rack mounts into they simply pull up fo removal. No tools required, just slide the access sections open, stick a finger in the slot and lift.
Thank You very much for Your fast answer.
yes, it is the front to back aluminum strips that the roof rack mounts into I am talking about.
I was afraid breaking something, before I was sure it is the right way to do it.