The compass is just a cheap little thing to fill the space left by that particular stem, which is taller than the 1 1/8" area of the adapter. The adapter doesn't quite match the finish of the VO stems, but it's easy enough to polish. You will need to use the wedge that came with a 21.1mm stem or modify the wedge that comes with the adapter.

I think my machine shop charged me $50 to turn down all three of them.