The first step is to remove the ear horns found on the back of the ARGO.
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Using the flat side of the included adjustment tool turn the locking mechanism from lock to unlocked and pull the ear horn straight out.
Repeat on the other side.
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Grab the included elastic head strap and insert one end into the ARGO and lock the mechanism included on the strap using the same flat side of the tool.
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Repeat on other side.
Adjust the head strap to the preferred setting. Congratulations, the head strap is now installed and the ARGO is ready to be used.
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