Thanks guys. Just came back off holiday today. My set of new thrust balls was on the mat when i arrived so i set about building my rear diff (I had a thrust ball missing before).. but i have gone and broke the diff screw. It sheared at the diff nut, clean off... so i have had to order both. I think my diff is cursed. It was my own fault, i wasnt reading the instructions and thought i would tighten it like my B4 diff (fully tight then 1/4 back)... you cant do this as I found out....
Neil