On my computer this is a 6mm screw, longer than the screw in the previous step 57

On my computer the rear screw is 6mm and the front one is 4.5mm. But my computer has obviously been disassembled bdfore

These are the bottom two screws when the computer is positioned as shown

It may be easier to disconnect the DC-in connector from the DC-Sound board end of the connector rather than from the logic board side of the connector

When the heat sink is removed, notice that there are two, black plastic spacers on the upper side and two more on the lower side. These are located about 1.5" (3.5cm) inboard of the two fans, on the edge nearest the hinge. You can see the upper ones in the photo. I believe they are glued in place but then glue can break and the spacers fall out. You need to put them back in.

The ground loop attaches with the T8 Torx screw nearest the display

Ground loop goes on T8 Torx screw nearest the display