Great video Dave - thanks for posting - well explained and the work done safely. I have done this exact same maintenance on my 2020 Boxer 2 weeks ago. I don't think the 15Nm torque technique for the centre adjuster works very well - I found it better to adjust so the handbrake is tight at 5 to 6 clicks then check the wheels are free turning when handbrake is off. Even though the wheels were turning ok one side on mine was dragging a touch and getting hot following a test drive. Took one wheel bolt out and slackened the star wheel 2 teeth and it was then ok - handbrake still on tight at 6 clicks. I have seen several YT vids where the centre adjuster was tightened but the wheels were not checked as free to rotate with handbrake off afterwards - risk of binding and overheating. I flushed the brake fluid all 4 wheels also.

I would invest in some waxoyl . those chassis cross members are starting to rot !