Hitachi V-21W - Manual (Page 33)

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GM-51 5-inch viewfinder attachment
Use the separately sold AT-30 viewfinder adapter when installing the GM-51 5-inch viewfinder.
1. Raise the lock lever of the AT-30 horizontally and remove the viewfinder mounting screw from the AT-30.
Insert this screw in the bottom of the GM-51. Insert the screw together with the GM-51 into the AT-30 and set
the lock lever forward, then turn the lever clockwise to secure it.
Warning: Be sure to tilt the lock lever forward and turn it clockwise to
tighten it. If tightening is overlooked, the GM-51 can drop
and pose a risk of injury.
2. Insert the GM-51 and AT-30 into the slot at the rear of the handle and slide them forward until a latching sound
is heard from the release knob.
Warning: Press the release knob to where a latching sound
is audible. If not securely attached, the entire
viewfinder can drop and pose a risk of injury.
Set lock lever B of the AT-
30 rearward. Turn lock lever B clockwise and
check for absence of wobble at
the AT-30 mounting. Connect the viewfinder
cable to the camera
viewfinder connector.