i am trying to apply strain gauge on springs

i need some extra information

1. is it specific direction for adding rosette ?

2. is it any formula to choose size of rosette due to wire size ?

3. is there other method to measure shear stress on springs(exprimental ) ?

4. is there any formula to compare inner surface stress with outer surface stress of springs wire ? ( i know k factor but it just gave me max stress not min for outer surface )

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