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Sorry to hear about your experience.
Regarding the "there should be a redundancy for this" I disagree. While you may feel this way now, after the incident, from what I can gather, if they were installed correctly and or by a professional, there wouldn't have been a problem.
Not different to not doing your wheel nuts up tight. Or seat bolts up tight. Or subframe bolts up tight. If you're going to put in a redundancy for one thing not being installed correctly, there's a thousand others you'd need as well. It's not practical.
20ft lbs seems light. I think there is far to much focus on forums on correctly
Torque ing something down. This isn't NASA. I would guarantee that half the torque wrenches guys are using aren't accurate anyway.
How would I have tightened it? Impact gun. BZzzttt Bzzztt.
There's very few things I use a torque wrench on. I don't even own one. But on the rear occasion I need one, I go borrow a mates really good one. I have three impact guns though. A big snap that'll crack anything (it'll even crack a flywheel bolt on a 13b) i only use that on suspension bolts etc A medium sized one, that I use on typically 12-14mm bolts and wheel nuts (because at full tti it won't snap a stud, unlike the big gun) and a little drill that I use for 8-10mm bolts. I've found this system works well, I don't snap bolts, and I don't have things come loose. You'll find it's how every actual mechanic does it as well.
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