I cut the lower tailgate piece off and sliced it into two so that the most rearward piece was long enough to slide under the flap when it closes. I used double sided 3M VHB tape for the rearmost piece and another type of thin but strong double sided tape for the flap. I'll see how it goes and...
Just installed this ... https://www.amazon.com/dp/B0C744L1G5?psc=1&ref=ppx_yo2ov_dt_b_product_details
... plus two of these ... https://www.amazon.com/dp/B099PNCQ9W?psc=1&ref=ppx_yo2ov_dt_b_product_details
Needed a couple of small pieces of double sided tape to stop the rubber inserts coming...
I updated the original post with a better fix (see above), so just bumping here for anyone interested. I have a mobile service booked and I will keep that only to ask how they would fix it. If they sound confident I may let them do it, but I read above that sometimes the grille can be damaged so...
Bear in mind I didn't hear any movement or clicking. I just held it with as much pressure as I could for as long as my fingertips could take. Maybe try a bit to the left and right?
I picked up my new R1S on Thursday and all was A1 part from a minor door alignment that I can wait for the 1st service visit. However, after checking out max volume on the audio (great!) I got the well documented dash speaker/grille buzz/vibration/rattle. I saw some fixes on here like pushing...