thanks mate, thats a nut I have used as a temporary solution, works fine - but I was thinking to maintain the look of the dji, looks a bit odd, though fully functional ... still cant understand why the nut came off in the first place as I had enough locktide on it, did fly it a bit rough though testing zick zacks through a tree alley to work on orientation ... I will check with the guys who sell dji parts, maybe they never thought of stocking them as a replacement nut is easy to find ..
thanks
Sev