Teardowns I've Worked On
Apple Pencil Teardown
I don't blame Apple for not making it fixable. That's pretty hard at this scale. Two co-workers and I developed the active stylus for the DROID XYBOARD (http://www.a4c.com/product/motorola-droi...) a few years ago, and it doesn't come apart without a long soak in 100% isopropyl alcohol (0% water, obviously) to soften up the assembly adhesives. But at least it ran on an easily replaceable and surprisingly easy-to-get AAAA battery, getting about 6 months of life per battery.
Linksys BEFSR41 Teardown
The 20PT1024X parts are Ethernet LAN magnetics from BothHandUSA, a common supplier of Ethernet magnetics (a term referring to an integrated monoblock containing per-wire-pair transformer and common-mode choke).