GoPro HERO4 Silver Mode D'emploi page 85

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/ Using the Mounts
LOCKING PLUG
If you are using the HERO4 Silver in high-impact sports such as
surfing or skiing where significant impact might occur, use the special
locking plug to securely lock the Quick Release Buckle fingers into
place. The locking plug helps to prevent the housing from accidentally
releasing from the mount. The circular ring fits over the thumbscrew
and acts as a leash to prevent dropping or losing the locking plug.
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