I was trying to reapply the thermal paste through iFixit guide http://www.ifixit.com/Guide/Installing+MacBook+Pro+15-Inch+Retina+Display+Mid+2012+Heat+Sink/10293/1 I got the tools. - W1.2 5-Point Pentalobe screwdriver - T5 Torx screwdriver - Plastic Spudger Great! I manage to unscrew all of them and re-apply the thermal paste. Job's done, screw all the carefully managed screws back in. Well. Somethings went wrong. One of the silver screw for heatsink mount near the fan got stripped after I screw it back on. The green one "One 3.5 mm T5 Torx screw" (photo from iFixit) I am sure I didn't use excessive force. (my rMBP 15 is a refurb, don't know if this matter? The previous owner already f-ed this up?) But when I unscrew that, didn't seem to have any sign of strip/dent on it. But when I screw it back on, I feel the the screw and my screwdriver wasn't feeling perfectly fit(the rest of the screws are perfectly fit) I knew something's up. The actual screw on my rMBP I tried some usual method. - rubber band between the screw and the driver. - a little larger Torx screwdriver. - use with philips/flat head screwdriver Didn't help at all, by the means. Only made it worse. You can see the photo. Now my last resort is solder another screw on it to unscrew it but this is really my last resort. So my question is. Any of you have better idea of how to get it done? Or I should bring it back to Apple store and seek for their help? Will Apple help me on this? If no. will Apple void my warranty because of this? if Apple won't help me and I managed to unscrew this screw. is there a way I can buy a new screw from Apple? I checked iFixit, they have the part but they only offer one package which include ALL the screws in rMBP. I don't need ALL screws and needless to say it's quite expensive. So iFixit screws package is my last resort. Any input will be greatly appreciated. Thanks!