After much investigation, I found out that British 3 pins plug (BS 1363) on Macbook's (any model) power adapter had a design flaw that cause periodic electric shock to users due to NO GROUNDING.
My solution is simple. I had redesigned the plug. I did some crude proof of concept modification and it works. I didn't continue building a full pledge working prototype because I don't have a 3D printer.
Highlighted the problem to Volex, the main contractor, for Apple power adapter shortly after my submission. Nearly land me a job as Principal Product Design Engineer >)
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