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Hi I have a simple and maybe trivial question. I have been following this guide: MacBook Pro 13" Retina Display Early 2015 Heat Sink Replacement When I start to assemble my macbook again, am I supposed to put the foam stickers in step 8 and the plastic cover in step 4 on again? And if they are not sticky anymore, what do I do then?

I wouldn’t worry about the battery sticker. The foam gives some impact protection. I’d put the on and hit with just a little heat from a hot air gun or even a hair dryers, not to much.