Back in 2007, a hole in a solar blanket could have threatened the International Space Station's long-term power supply, but spacewalking astronaut Scott Parazynski patched it up with a homemade solution.
The 4B wing of the Port 6 solar array truss snagged and ripped when it was being redeployed to its permanent spot. Mission managers scheduled a nail-biting spacewalk that involved Parazynski riding on the station's robotic arm to the distant edge of the solar array. He patched it with a makeshift "cufflink"
built from spare parts.
Also during this mission, spacewalkers committed one of the multiple tool-drops, losing a pair of needle-nose pliers that drifted away as they entered the station's airlock.