DB9 Top Gear Track
AO Silver Member
Join Date: Jan 2007
Location: United Kingdom
County: East Sussex
That nut will turn, and with it the damper/shock rod, you should see the corresponding nut on the other side of the car turn in exactly the same way.
That nut holds the upper mounting cup and rubber doughnut in place and is under very high tension from the spring.
Look at the above image, if you tightened the nut on that strut it would reach the end of the thread and then the rod would turn, it's there to prevent the whole lot flying apart.
You'd need to take it to a garage with an air impact gun, they could buzz it up if you're concerened but it's almost certainly not the cause of your knocking.
All the best
Loose - not close, compact, or tight in structure or arrangement
Lose - to part with or come to be without, as through theft, accident, negligence, etc.
Last edited by pubsinger; 20-07-14 at 12:02.