Anyone ever have this happen? I removed the struts in the NK to replace springs, used an impact driver to remove large nut on top (it's impossible to hold the shaft and turn the nut, same strut bearing as an e9). Everything was fine, put it all together, picked up strut by the bearing, and the insert came apart! I believe the threaded rod below the piston screws into the small bottom cap but it takes a special tool to remove. I called Bilstein, they are 2 hours away, yuck!