How to open MacBook air superdrive to fix torn cable sheath

hi guys... great site...

I got a mac-book air SuperDrive. The sheath on the usb cable is torn right near where the cable goes into the unit.

I can somtimes push push push it into the unit but eventually the tear begin to show again.... i want to open the unit and push this horrible torn section INTO and beyond the rubber plug which can only be done from the inside... I know there are some tabs on the side but i dont want to ruin the look of the unit forcing it open incorrectly

Please help