Viega 8326.1 Instructions For Use Manual page 18

Handling
Insert the threaded bolts so deeply that the upper edge of the
threaded bolt sticks out approx. 15 mm behind the upper edge of
the tiles.
Secure threaded bolts with a 90° turn.
Screw actuating rod into the tapped hole.
Set the screw-in depth flush with the upper edge of the tiles with the
help of the template supplied.
Screw on basic panel.
Flush plate Visign for Public 1 18 from 20