Prior to buying the SST I built something like that without knowing anything about the POoR thread. It falls short because of the camber that is machined into the OE knuckle castings (no idea about the aftermarket knuckle shown), but it is what I'm using for a relative reference.

I mentioned in my first post that I have Marlin's seals. (They're installed now, my deadline isn't giving me much time to sort things out.) I just don't want to rely on them too much. If the knuckles are centered, or at least fairly close, then the seals have a much less tough job to do and will last longer.

I need to look at it again. I'm saying that it's low and I'm saying that adding shims won't help. That doesn't make sense sitting here at work, but it made sense when I was working on it. Whether my head's on straight or not, the FSM procedure resulted in a negative number in this case, and it makes no mention of that possibility. At 0.04" and assuming that shimming it does work then one thick shim on the bottom should make it all good.