It's confusing isn't it. I understand the disc springs are there to maintain the force on the diff washers as the parts wear out. I wonder does this also keep the pressure (and therefore diff action) consistent if there are uneven spots on the washers or carriers?
Jason's been racing CATs for years so I'm going to try his way )()(
It also gives the same instrcutions in the new CAT SX manual.
The plastic cap doesn't over the larger disc springs so I'll put a bit of foam like Jason does.
I would also sand the diff plates with 600/800 grit wet and dry on a flat surface e.g. glass table, use ceramic balls e.g. Abec35.com and maintain the thrust bearing well. Thrust bearing sthis size are difficult to get hold of because the old axles were 1/8 diameter, which is just over 3mm, which is more common. Even one I bought from Schumacher, only one of the thrust plates fit. I had to buy two and use the larger plate from both.
I just ordered this one...
http://www.abec35.com/Thrust-Ball-Be...duct_info.html