I had an issue when I originally built the diff the circlip was damaged when I was a bit heavy handed tightening it. I used the method of winding it up then backing it off, DO NOT use this method it will end in tears and a diff rebuild.
The second time I used extra helpings of brake cleaner so the circlip gets a better hold of the outdrive and tightened the screw gradually. Now smooth as silk.
If you're not using proper circlip pliers then that'll be a big part of your problem. Another thing you must do is to make sure the outdrives are properly cleaned of oil, it makes such a difference in my eyes.
I thought the diff was a bad design originally but now I realised that it needs more care and attention during building compared other manufacturers that's all. I'm now happy with mine.
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