Yup I had the same problem – and I use XRAY ECS drives
![Cool 8)](./images/smilies/icon_cool.gif)
. You need serrated nuts but you need to realise there are serrated nuts and serrated nuts. I bought a set from a big brand name and they were hopeless. I proved this by holding two nuts together and turning them against each other; no grip whatsoever.
The best I ever had were from Poland I think and they were orange too
![Very Happy :D](./images/smilies/icon_biggrin.gif)
but my online shop has been unable to get them for the past year. I am currently using Hot Bodies serrated nuts which come in blue, not as good as orange but acceptable
![Wink :wink:](./images/smilies/icon_wink.gif)
, after the big name failure and so far they have been fine.