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Perhaps as others have said, a load indicating washer is in order. You can get them that compressor that leak a die, although I suspect that will be forbidden too!
Someone has already calculated that 900ft.lbs will give the right amount of compression, so once you find out what that number is, maybe you can have some load indicating washers made up.
Then you can use your current method for the first four torque amounts (doesnt really matter how bang on they are right?), and then the washer will be used to prove or disprove your final torque.
not sure if you can get load indicating washers that big mind. I've never needed to torque anything that much!!
What diameter are the fasteners?
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