Originally Posted by biz77

https://www.apexrc.com/collections/rw-racing

The thrust bearing utilizes two washers that have races the balls typically fit into. There are two slightly different sizes. The larger one goes in first then the thrust bearing then the smaller one last. It would typically be installed like so:

[|:|]

I install the washers with the races facing away from the thrust bearing balls like so:

]|:|[

This would give you a little more clearance to account for the smaller 3/32" balls. I can't guarantee it would have saved you from your other efforts as I don't have any 3/32" balls/gears to try it with (I gave up on CRC spurs long ago - even on CRC cars). I run the thrust like this because it makes the diff smoother.

Hope that clarifies it?