Naish Fusion 5-Line Manual page 13

IV - Assembly
3) ATTACHING LINE EXTENSIONS
Step 1: Insert the loop end of the extension line
through the foolproof connector loop on the flying
line as shown.
WARNING: The loop end of the extension line
is opposite the foolproof connector end of the
extension line.
Step 3: Pull the lines tight to secure the connection
as shown.
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Step 2: Then insert the foolproof connector end
of the extension line through the loop end of the
extension as shown.