This is really for step 23: reassembly
You can not get the orginal screws back in to hold the new optical drive replacement in place because there is a black plastic filler running along the front edge of the part. There is no place for the screw head to go. I had to remove some of the plastic to get the machine reassembled. Whoever tested this overlooked what I think is a major problem. How many macbook pros are out there with only one (maybe two if you're lucky) screw holding this thing in place?
I got extra screws and have no idea why. The bits included in the kit are poor and don't work on most of the screws. I had to use my own tools instead.