If it were just for mass production, Apple service wouldn't have gone around replacing older screws with the new design: http://www.cio.com/article/2411922/con

If it were just for mass production, Apple service wouldn't have gone around replacing older screws with the new design: http://www.cio.com/article/2411922/consumer-technology/the-case-of-apple-s-mystery-screw.html http://www.cio.com/article/2411922/consumer-technology/the-c... Besides, Apple wouldn't necessarily want devices to be unserviceable - repair fees are a source of income as well.