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The iFixit folks have several excellent upgrade kits and include
all the tools you need to do the work.
But ... be careful, they're not for those with weak eyes or big thumbs. Or
anyone in a hurry 
And an upgraded old machine can be fully functional, but still fall off of Apple's
software update list. E.g. I've got a 2013 MacBookPro that I have upgraded, but
the latest macOS won't install on it. Too old.
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