Replacing a broken keyswitch in an Apple IIe keyboard, and upgrading the power light bulb with an LED.
Some basic soldering skills are required.
Tools used:
“Third Hand” soldering stand:
http://amzn.to/1PjTLkO
Soldering iron (adjustable temperature):
http://amzn.to/1jcMIhi
Desoldering iron (solder sucker type):
http://amzn.to/1PjTCxQ