Sony Ericsson W705 Working Instruction, Mechanical page 21

Replacement: Knob Lock for Battery Cover
INSTALLATION
Hold the Knob Lock like this,
and place it on the Rear Cover as shown in picture.
Press down with the flat end of the tweezers until it snaps
into its proper position.
Check that the Knob Lock is properly installed by sliding
back and forth.
1225-1010 Rev 1
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Sony Ericsson Mobile Communications AB – Company Internal
Working Instructions (mech)
21(70)