Sony Digital betacam DVW-707 Operation Manual page 220

Reattaching the eyepiece
1
Align the mark on the eyepiece locking ring with the one on the
viewfinder barrel.
2
Align the mark on the eyepiece end (see step 2 in the illustration for
eyepiece detachment) with those on the eyepiece locking ring and
viewfinder barrel. Then insert the eyepiece into the viewfinder
barrel.
3
Turn the eyepiece locking ring clockwise until its "LOCK" arrow
points at the mark on the viewfinder barrel.
5
Note
When the eyecup is worn out, replace it with a new one (service part
number 3-723-079-02).
5-16
Chapter 5 Setting Up the Camcorder