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Have you tried laying the balance cock upside down on the bench, and placing the balance on and feeding the stud through? This way you can line up the stud and also the balance spring in the regulator pins, then tighten the stud screw, flip it over and install it on the movement.
This is how I go about it. It is possible with a round stud to rotate it accidentally and deform the hairspin. This hasn't ever caused any damage in my experience but it will prevent the movement from running. Just make sure the hairspring coils are concentric when you tighten the stud, or you get to do it again.

BTW, it is still possible to slip off the stud and mangle a hairspin but this is also quite possible with the other method too.
 
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