I just finished replacing the knuckle (trunnion) bearings in my front axle, and I am not sure what "centering tool" you are looking for. I installed the new inner races with a hammer and a bearing race tool, then put on the knuckle arm and upper bearing cap and checked the pre-load with a fish scale. The bearing sets I bought came with a range of shims. The SST shown in the manual is for pressing out the races, which I did with a drift and a hammer.
Upon talking with georg at valley hybrids, he advised its a waste of time, the 80 series are fairly forgiving and he runs all his with no shims at all...ill take his word for it.