Grey Button - Samsung 54PZF

I think you mean the "Bounce Lock Release" button?
You have to push it to move the head

Matt
http://www.mattmatic.co.uk
(For gallery, tips and links)
Barrie
Too Old To Die Young
http://www.pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/
bforbes
Member
Co. Durham UK
Barrie
Too Old To Die Young
http://www.pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/