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It might be a matter of how the screws are driven in, and not that they're slightly different sizes. When I reassembled my MacBook, a couple of the screws, including the one over the optical drive you mention, were hard to drive in and jutted up a little bit instead of sitting entirely flush. Swapping screws didn't help. The solution was to unscrew them and drive them in at a bit of an angle - perpendicular to the slightly curved surface of the back plate where the screw holes were, instead of fully vertical with respect to the ground the Macbook is sitting on. Doing it that way, the screws were easier to drive in and they all ended up flush in their holes. Didn't matter which screws they were. (I swapped a few around just to check after reading this.).

Actually the four screws on the bottom were not threaded all the way up. I didn't check to see if the thread gauge was the same on them, but it wasn't until I had about four screws out (I didn't take them out in the order that the bottom all came out first) that I noticed a difference.

The Late 2011 MacBook Pros ship with OS X 10.7 Lion, but because this is a relatively minor revision, they should still be able to run Mac OS X 10.6 Snow Leopard. This is the second MacBook Pro generation with Thunderbolt, a 10 Gbps data connection that uses the same connector as Mini DisplayPort.

I then took out the rest of the bottom ones to see if they matched the two that were already out that weren't threaded to the top. So I went under the assumption that those were all bottom screws and when I put it back together everything went fine with no resistance. So there are three types of screws: Four for the bottom, three long ones as indicated and three others that might be slightly smaller than the bottom ones. Hi, Although its more than a year since your contribution, I thought you might be amused to know that it is not just that the screws go in more easily when at an angle, Apple actually drilled and tapped the holes at a 15% angle. I too had tried to drive them in straight. An Apple 'genius' - I was in for something else - clarified the design for me.

It was done so that the screws lay flush on the angled part of the lower case. Nice design, but since Apple encourages DIY memory and drive changes, they could have mentioned this little.

Worked like a charm! Took less than 20 minutes. 2015, and the fan cost me about $10. It was the same brand/model. SUNON MG62090V1-Q020-S99.

Windows player for mac. SOME TRICKS - 1- no T6 screwdriver- was careful using needle nose players to loosen 2 screws protruding up, then use a small phillips to push real hard into the T6 slots, SLOWLY turn, also used a small flat head screwdriver (for eye glass repair) was able to grab thread on T6's, made a small mark with screw driver across the top so I could see when it started to turn. 2- no spudger -made one; cut a little strip 1/2' x 1 1/2' of plastic. Couldn't get it to slide under plug, there's an edge where plug fits. So lifted old fan out, pulled upward on the plug it popped right out with very little effort. I used my home made spudger to push the new plug into place.

3- download free 'Macs Fan Control' This is how I was alerted to the fan not working in the first place. Program shows temperature of all key components in the computer. Cheers- Durango CO! Please be aware that you CAN do this replacement with MUCH LESS work. I successfully replaced a trackpad (TP) in this model WITHOUT removing a lot of what is described here. I think i mainly removed the logic board (LB) anchor screws along the TP side and was then able to lever up the LB just enough to get the cable unplugged and snaked out.

Followed the reverse and done. Maybe not for all, but it worked for me. // Re screws: i print out the images here of the multi-screws locations and then tape the screws in place on the print-out. I will be buying a battery from you and using your instructions. I just installed a new CD/DVD using your instructions and 1) I feel like I owe you something and 2) Although more expensive, I have the confidence your battery will work. My current battery is the original with 1399 cycles in 7.2 yrs.

A tech buddy had bought me a replacement and I installed it. I had just installed a new OS and the kernel_task went going nuts, using 90% of the CPU. Hours on the phone with Apple did not resolve the issue. On a whim, I put the old battery back in and Voila! But I cannot risk my battery swelling and going south on me.

I am also going to buy your installation tools. Yeah, I already have them. But you can never have enough toolsor beer.