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Re: torque setting
It takes a helluva lot of force to break a CV joint so as you say it must have been faulty.
No doubt as you have discovered marking a nut and then attempting to tighten it back to its original position isn't a good means of tightening to the correct torque. Nylock nuts just don't work that way.
Also if you renew the nut as recommended it will surprise you how easily it tightens up to the correct torque.
Currently in madnoel10's garage:
Honda Civic 1.4l