I went ahead and rebuilt the 20T turbo tonight. I learned that someone messed up designing or machining the turbine shaft as it pushed a thrust collar right into a thrust bearing it shouldn't ever bind to. So the turbo was locked up when I went to tighten it. I now know why there was step put into the original thrust washer to account for this. I'm really not sure if this common practice when building a turbo but it makes it a pain trying to put it back together. I'm kinda disappointed but it's not the first time I seen parts adjusted to fit.