I have a background in gunsmithing and the cardinal rule for us is nothing gets screwed in or tightened without using a torque screw driver and precise pound per inch to ensure optimal (consistent) performance.
Why don't PC builders follow similar canons? PCs experience various temperatures, are occasionally moved around, and contain dozens of fragile parts. To me, these are all reasons why properly mounting and torquing your motherboard, heat sink, and other components to a precise pound per inch is critical. But all I ever see is advice to "tighten things fairly tight, but not too tight," which drives me crazy because it's like someone defining a word with a word.