Tips about sockets are not that great... Do you want to test unknown socket with POS neon bulb on yourself? Does simple plug-in socket tester detect
all problems with socket wiring?
You can do that in desperate times, but it is not a great way to do it.
Tip about small drill bit holder is interesting. However, I consider hand-held drill to be too wobbly (by construction and by the user) to be used with such tiny drills without breaking them. On drill press it should work nicely though.
Nice tips overall, but keep it to your knowledge level about the subject.