I have a 2012 MM that I had previously installed a 2nd HDD (500 GB SSD) using ifixit upgrade kit. The SSD was getting full so I ordered a 1tb SSD to replace the 500GB disk. Following the fixit tutorial I found that when I got to the step where I remove the screws for the fan, one of them (attached photo) won't come off the fan and cowling. Even when I removed the fan and cowling the screw will not come off for some reason. Then after removing the fan and cowling I found a spring underneath that I don't remember seeing anywhere when I first installed a second HDD. Then to top it all off I forgot to remove the HDD connector before I pulled out the logic board, snapping it. There's also a small plastic tube(attached photo) that I've guessed goes onto the third screw of the fan that I'm not too sure about. 1. Has anyone else experienced a stuck screw holding the fan and cowling together and how did you remove it? 2nd photo 2. Where does the spring and the plastic tube go to? Photos 1,3 & 4. Spring is on a T6 or T8 bit. Forgot which one I was using at the time of the photo.