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I think my comment wasn't clear. The hair spring should not be attached to the frame when you rotate it 90 degrees on the balance. All rotating does is position the two screws that hold the impact housing 90 degrees from where they currently sit, which makes a difference in the adjustable limits of the housing as it sits on the balance. I initially assembled it without regard to the position of the screw holes on the balance for the impact housing. Therefore I didn't have the correct adjustable range for the housing until I rotated it.