Today's record for the tape, m'lud ...
iPhone 4S replaced power switch, which required a total disassembly of all parts bar the screen, including philips headed screws of the following various lengths -
1.2mm
1.3mm
1.5mm
1.6mm
2.4mm
2.5mm
2.6mm
2.7mm
3.6mm
Nice tolerances there... they were really going for shaving down the external size. Several alarming ping-fukit moments, scrabbling around the carpet for the bits that took flight.
It's a flawed switch design, a small nodule of rubber on top of a tactile spherical button that either crumbles or goes missing. A whole replacement secondhand assembly (switch, ear spaker and light sensor) from eBay china costs £3, and a couple of hours later it's all back together fixed.
That ifixit website is not a bad effort for this, but doesn't have adequate deep water warnings for the few that might attempt this as their first bit of "electronics" - as evident by some of the in-article comments.