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What is your question?
My '08 Corolla S (22,000 mi) makes thunking noises going over joints in the roadway. I was checking for loose nuts, and found that both front struts have a gap between the top nut and the strut piston. When I tried to tighten it with a socket, the whole piston turned, but the nut did not tighten.

1 Reply
The inner shaft has a flat that you can grab with a vise grips or crescent wrench to stop it rotating the outer nut is 17 or 19mm with the wheels on the ground tighten it tight probably 50ft/lb. With wheels on the ground the weight captures the spring you could undo the nut and apply loctite to secure the nut.