Can't detach shaver head (Beurer HR 8000)

[Swamp Thing]

The shaver head in the Beurer HR 8000 (rotary) is supposed to be detachable, so you can swap it with a supplied alternate accessory. But try as I might, I just could't take it off. Does anyone have this model, and have they managed to detach the head?

This guy seems to have to struggle a bit, too... [05:40]

 

[berkeman]

Have you looked for a YouTube video that shows it? I'm amazed how I can usually find a YT video that shows exactly what I'm having trouble with...

 

[Swamp Thing]

One video I have linked to in my post. The guy seems to be bracing his arms against his stomach and pulling really hard, which happens off screen.

The manual says, "The shaver head must be held firmly on two sides and removed with a sharp tug".

There is a place (with parallel lines stamped in) where you have to press with your thumb, but it doesn't budge.

This is another video where it looks quite easy, but it doesn't work for me: [01:50]

www.youtube.com/watch?v=1OWR-L_CmgY&t=110s