Some extra tools I found to be invaluable in this whole process was canned air (used for keyboards and office dust), a microfiber cloth (preferably the one that came with your iMac if you still have it, but you can get these almost anywhere these days)and one of those soft foam monitor covers to put over the monitor while your friend is holding it up (a soft sheet or towel might work too). If your computer is a few years old like mine, there will be a considerable amount of dust that you will want to clear out (and will fly everywhere anyway). Once you cleared that out and replace the hard drive, wait until you've got the bezel and screws back on before using the canned air and microfiber cloth to make sure all dust and lint is clear of the monitor. This is where the second person will come in handy again. They can wipe while you spray. Get your glass top with suction cups still attached ready and wipe that with the cloth and air as well. While your friend does one last wipe of the glass and then the monitor, put the glass on as soon as possible so no more lint or dust falls onto the monitor. I did this and the monitor looks as beautiful and clear as the day I bought the iMac. It is truly a brilliant and beautiful design by Apple and LG.
Make sure you don't forget this step! I forgot this step, got everything back together, then had to take it all apart again to affix this! Not fun. That said, the second time went MUCH faster, and I found myself appreciating this design a lot more. It is much less daunting now, and is much easier than upgrading the RAM in a Mac Mini.
I found these instructions to be a little unclear. What you are looking at after removing the foam, is a bracket that is basically holding down the thermal sensor at the end of those wires coming out(which you can't see because it's UNDER the bracket). I found the bracket to be fairly easy to just pull up and off. The spudger (or even a tiny flathead screwdriver) can easily accomplish this if it's glued on tight. Once the bracket comes off, the thermal sensor is freed, and in my case fell away from the bracket. Just try to keep those pieces together in the order they came off. Fortunately, as easy as the bracket came off, it was easily pushed back onto the new hard drive with no trouble at all. The foam was pretty sticky still as well, although I had to double tape one side of it to secure it over the bracket.
I honestly didn't find the spudger to be necessary for most of this replacement. It is a nice little tool that makes one or two steps easier, but it is far from necessary. I imagine an old stylus you may have laying around would do just as good a job. I would definitely suggest putting the iMac on it's stand straight up to remove the hard drive bracket from it's post, as it sits very tightly in there. I found it popped out a LOT easier on it's stand than laying down, which was next to impossible. You do have to do some careful manuevering with your partner in order to accomplish this, but it's worth it. Take it slow.
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