In the version I am looking at 17 is shifting the main board and not needed for drive only replacement, 18 is pulling the drive out

if the problem is that the scroll wheel spins freely, the button next to it controls that.

the ribbon connector clamp flips up 90 degrees from pcb

Please note, the tabs are just to block the outer case from sliding back in the next step — there’s no big trick or force required here, just flex the side of the case enough to get the tabs to slide past the metal bar.

HEED THIS WARNING!!!! Not doing so failed my entire repair. When I looked with an eye loupe, I could see one of these components by the connector had been knocked loose after I removed the connector. Pry from the top ot the connector or top right corner only.