rekey lock cylinder

I am switching my BMW luggage to a different bike (same age) and need to re-key the locks. I know the idea is to press the last locking wafer on the cylinder so the barrel can pull out. Can anyone explain how you're supposed to find and press that wafer. There's a small plug in the interior...

Trying to save myself the 3 x $70 cost of ordering the re-keyable lock cylinders for my wife's R1200R. I managed to get the cap off one of the old cylinders to pull out the stupid locking bar, but mauled it so bad in the process that there's no way I could put it back together. They are staked...

This is a unique problem that I’m hoping someone might have an answer for. I purchased a top case from a 2016 R1200RT, unlocked, with no key. I need to get the lock cylinder out so it can be re-keyed to my 2015 R1200RT. It’s a difficult task that is made more problematic by the fact that BMW...