I know engineers like their toys and I respect the fact that they want the freedom to explore and even fix their gear. Yet the truth is, devices like the iPhone or iPad or even any other complex consumer electronics device aren't really designed to handle the wear and tear of the the general public mucking around with their internals. If you ask me, it's asking for problems. These are highly complex, integrated, and mostly closed devices. It's not like the old days of loading up your desktop or laptop systems with add-ons boards or other configurable components to extend functionality. What would be the likely reason for engineers or even non-engineers to open up their iPhones in the first place?
Linear guides are one of the most important components required for the design of automated or computer-controlled equipment. Aluminum profile extrusions, used for these guides, can enable designed-in functional features.
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