In Step 8, be careful when putting back the airport black plate that there is a little lip under the thumb (in the photo) and needs to be inserted underneath the outside black frame before rescrewing the 2 screws.
Secondly, I used this guide to add the data doubler caddy from OWC. Be sure to unscrew the philips screws and the little metal plate on the outside of the optical drive and attach it to the caddy. It will allow you to attach the 3rd torx6 screw of the caddy to the frame closest to the center.
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