Cheers Niel, I cant wait to get it all back together.
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Building the coilovers I noticed that the topmount nut was only on the dampner thread a few turns:
So I measured the top of the strut below the threaded section and worked out how to make the nut sit fully on the threaded section. Fired up the lathe and drilled out the required diameter:
Just need to weld the threaded tube onto the strut and its ready to go