How do I center a hinge on a part/union?

Im trying to create this gigantic spinner, but i cannot find the perfect place (the center) of the unions to place the hinge on, is there a shortcut or a plugin that can easily help me find the center of a part?

just put ur object to the position of 0,0,0 and place the hinge there. sometimes union boundary boxes are weird so i would suggest pressing ctrl+g twice and setting the origin position to that

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