I have a 2005 R1200GS and I am trying to replace a broken luggage support (rear tail section that the Vario bags hang from). I have the whole tail assembly off but can't get the lock cylinder off to transfer the whole lock assembly to the new-to-me tail section. I put the key in and then push the tab in on the cylinder but it won't budge. What am I doing wrong? There are tons of videos on this but they all just say to do what I'm doing. None mention the seat lock though, they are all for luggage locks. Has anyone else had to replace their broken tail section and dealt with this lock issue? I even subscribed to the online Haynes manual but it only says how to remove the tail section, no mention of the lock assembly.