I found a neat little tool to help seat this bearing on the stem. Do the usual tricks of putting the stem in the freezer, heating up the bearing in the oven and oiling the stem. Then use the fork stanchion turned upside down as the bearing driver. It's dimensions are just right to fit inside the bearing to put pressure on the correct part. I used to rubber mallet to drive it home quite easily. Be careful not to damage the delicate threads at that end of the stanchion as you put it over the stem.
It's a perfect fit.
Home and dry.
I nearly forgot the washer when I started.
But it is there.
