Sony MPK-TRV3 Operating Instructions Manual page 12

Preparing
(2) Raise the buckles until they stop.
(3) Fasten the video camera recorder with the accessory belt.
When you fasten the video camera recorder with accessory belt, take care not to touch
the zoom button.
2
3
12
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Buckles
Check the O-ring and grease it
slightly.
O-ring
Accessory belt