Sealife DC 600 - Manual (Page 92)

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Step 3: Attach adapter around housing lens port so that it is seated into
the flash window recess.
If using two Flash Links, attach other cable in second hole and
follow above instructions.
Secure optical cable to Flash arm using velcro® ties (included
with Flash Link cable).
Refer to Flash link optical cable instruction manual for more
details and troubleshooting tips.