Back in '08 I'd eyeball filler thickness, but after a 2012 Ford Focus came back with a crack six months later, I bought a gauge and never looked back. | Auto Body Repairers - nhfree.com
Man, that hits home. I used to skip the torque wrench on lug nuts, just "good and tight" with the impact. Had a wheel come loose on my own truck going down a gravel road, scared me half to death. Bought a good torque wrench the next day and now I check EVERY single one, no exceptions. That noise is something you don't forget.
My uncle's been a mechanic for 30 years and he just goes by feel, never had a wheel come off. Says a torque wrench is for people who don't know what tight is.