2nd SSD HD Alignment Screws
So I bet if I was trying to install a Samsung 830 vs. a 470 I would have had no problem aligning the screws?
I had bought a kit from iFixit designed for adding a 2nd HD.
It came with the alignment screws for the second HD and
Apples proprietary SATA cable. I installed the Samsung 830
in the empty HD spot which is the top HD position when the
mini is oriented correctly. When you install the HD the mini is
upside down so its on the bottom. I had to jiggle the mini around
a bit flipping it upright in order to get the alignment screws in the
Samsung to line up with the slot in the back of the enclosure.
You'll know the HD screws are in the proper slot when the logic
board tray can easily slide home. It wasn't difficult, just take
your time.