Struts coming loose?

On my 67 Dart I just replaced the passengers side strut bar. I’m about to do the drivers side. I think what is happening is that the large rubber grommet or washer when tightened down on pushes back against the loc nut when it is deformed. The original nuts on my strut bars are swedge shaped meaning that the nut is purposely slightly ovaled. It will only screw on when pressure is excerted or tourqed down on. Make sure you have that correct nut and torque to specs then use the blue locktite.