Notes
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Installing MacBook Pro 15" Core Duo Model A1150 Upper Case
On my MacBook, there were no pushbuttons. Rather, two mini phillips screws were holding the case on inside the battery bay. The two screws are under two ball-bearing-like nubs that help hold the battery in the bay.
Installing MacBook Pro 15" Core Duo Model A1150 Upper Case
I just realized these were the screws mentioned in Step 4, which I missed originally. Did you miss step 4 too?