It took a while to dig up these pics, and they may not be exactly what you were looking for, but...here you go.
Sorry for the poor quality, they were taken about 2006 using the crappy still picture mode of my otherwise brilliant Sony Digital-8 Handycam.
The first picture is a cooling mod for a Seagate 250GB HDD that ran at what I considered to be an elevated temperature (110F, 43C). As you can tell, it's part of a (dead) Compaq power supply. I guess it worked as that drive is still in service (see screenshot).
The other picture shows the use of a resistance decade box to adjust the Vcore of a K7S5A motherboard. The CPU (AMD Athlon XP 1700+) wouldn't run at its rated speed because the voltage was too low. I found the resistance that gave the necessary voltage, then soldered in a multi-turn pot of the correct value. About 2 years later the board suffered a Drive Controller failure so it was replaced.