I dropped my MacBook Pro (Retina, 15-inch, Mid 2012) on it’s corner. It didn’t cause any internal damage – the computer worked normally – but the the lid (with the display) became misaligned.
The misalignment made the lower right corner of the display scrape against the base of the computer whenever the display was opened. I thought if I could loosen the screws that held the display, I could realign the display with the base of the computer.
I used iFixit’s MacBook Pro 15″ Unibody Mid 2012 Display Replacement (by Andrew Optimus Goldberg (and 5 other contributors) as a guide to remove the lower case and to get to the six 6mm T6 Torx screws holding the display (there are three in each corner).
The repair is fairly straightforward. The only tools that I needed were a Phillips 00 Screwdriver and a T6 Torx Screwdriver.
1. Remove the lower case. (10 Phillips screws)
2. – Note: the links to the following two iFixit links are to illustrate the location of the screws – the screws shouldn’t be removed.
Slightly loosen (do not remove !) all six (three on the left corner and three on the right corner) 6mm T6 Torx screws holding the display to the upper case.
3. Close the lid and move the display so it properly aligned with the computer base (the part that has the keyboard).
4. Tighten the six 6mm T6 Torx screws
5. Reattach the lower case.
Two of my steel bikes, a De Rosa and an Eddy Merckx, have been crashed at some time in their lives – resulting in a bent derailleur hanger.
The last time I crashed the Merckx, I was going to have the shop straighten the derailleur hanger, but since this wasn’t the first time I’ve bent one, I thought I might as well invest in a Park Tool DAG-2.2 Derailleur Hanger Alignment Gauge
Using the tool is straight forward. One end of the tool threads into the the derailleur mounting hole. Using the tool as a lever allows the hanger to be bent back into alignment. There is an adjustable indicator that measures the run-out from the braking surface of the rim. When that distance is equal at four points (measured at 90 and 270 degrees for horizontal alignment and 0 and 180 degrees for vertical alignment), the derailleur hanger is in alignment.
Park Tool’s video on How to Align a Derailleur Hanger Using the DAG-2.2:
Whole Foods Freezer Case, Mill Valley, California.