Basically what i have found , is the reason the Losi 1-way fails is due to the outdrive cup moving partially out of the one way roller bearing (which is quite small). If you can prevent this they should run fine.
The way I run mine is, firstly glue the alu saver rings in place on the outdrive cups. Secondly (possibly most important) grind down the pins on the driveshafts until they pass easily under the saver rings at all levels of suspension travel. Thirdly take a scalpel (or xacto knife or similar) to all the plastic faces which come into contact with a bearing including the outdrive cup. By scribing a cross hatch pattern or similar to all the surfaces, this will effectively raise some of the material slightly and make everything a tight push fit.
Should the worst still happen (possibly after a heavy collision) rather than replace the whole "diff" half at a cost of $27, simply dissasemble and push out the one way roller. This small bearing can be purchased quite cheaply from any good bearing supplier (approx £4 localy here).
I would post some pictures to illustrate this, but Jimmy has my 1-way at the moment for an upcoming review. If this description is not easy to understand let me know, and I'll see if I can arrange some photo's.
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