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the a-3011 is the original thrust bearing that shipped in the first release of the jrx-2. subsequent versions had the "new" thrust bearing which changed part# to a-3018. The jrx-T "production release" edition of the manual lists only the 3018 part.
I've never seen the first edition, which apparently had major problems and was quickly changed out for the 3018 unit.

I think I do, I can check in a bit-

Hey Anthony,

It's pretty much the same type of thrust washer used on the rc10t slipper. It used smaller thrust washers and plates.

Regards,
Roger

For reference on the difference.
The screw is different type as well. Threads the whole length.

thanks.
With all of the losi cars I've gone through over the past 6 years since I started collecting I've never come across one of those.