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They are torque to yield, I don't think measuring stretch is going to be helpful.
The procedure in the TIS is the one I would follow, and be particular as to whether they say oil the bolts or not.
TTY is actually very forgiving. Even if you were 10 degrees off (+/-) it would still work fine. But of course with a torque angle gauge you should be closer than that..
I always just made my own from an old CD, marked the angles with a sharpie and lined it up with my breaker bar (don't use a torque wrench for TTY bolts). Works every time.
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