I would say anyone can put together a good diff if they can stick to some simple rules:
1. Take it all apart and clean it very throughly before inspecting everything and deciding what to replace
2. Wash your hands and work area down BEFORE rebuilding (there's no point rebuilding a ball diff if you are then going to contaminate the balls/rings with grease and oil - only silicone in your diff centre)
Keeping the inside of your diff contaminate free will greatly extend the life between rebuilds - grit and dirt in the diff and thrustrace (can be small stuff you cant see).
E.G. you have a slightly dirtly diff ring, this ring now gets a groove cut into it quicker than in a clean diff, the metal of the diff ring will then accerate the wear rate on the diff balls - and its just a vicouse cycle some people never break out of!
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