[Q]: Objective: Open a modern quartz movement watch to replace the battery.
[A]: Place the watch face down on a soft surface. Look to see the back is a screw on or a push on. Unscrew a screw on with the appropriate tool. Use a small screw driver to pry the push on type off. Put the new battery in place and reassemble.

[Q]: Objective: To remove a stripped screw.
[A]: Use a saw to cut a new screw groove.

[Q]: Objective: How to child proof a trampoline
[A]: To keep little feet from getting hurt on trampoline springs, cover them with pool noodles.

[Q]: Objective: Disassembling old power supply.
[A]:
Remove the metal casing of the power supply using screw driver being careful not to cut any wires.