My Spider has 3-point seatbelts and I’m wanting to install a guide at shoulder height to help corral the belts when not worn.
AutoRicambi has such guides…

“Remove headrest, install guide, replace headrest…” sounds simple enough… but I can’t figure how to remove the headrest… I car raise it to the position shown in the photo however it hits a hard stop at that point.
I don’t see any levers/buttons to push or pull, just the round receiver the headrest post slips into…
What am I missing?
AutoRicambi has such guides…

“Remove headrest, install guide, replace headrest…” sounds simple enough… but I can’t figure how to remove the headrest… I car raise it to the position shown in the photo however it hits a hard stop at that point.
I don’t see any levers/buttons to push or pull, just the round receiver the headrest post slips into…
What am I missing?