constraints and local rotate problem

#1

i have a trouble,i use multi-referential make a glasses following on the head joint. and i want to make the glasses to jump when the actor is surprise.

when i rotate the glasses ,it’s rotate center at null. though i have used the local coordinate .

otherwise,i use parent constraints.but a gray joint is appeared. I can not move the null that it is instead the groups.

#2

this wrong

#3

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