How deep would you have to cut into the side bars.
What if you ground a little away on each side? You know what I mean?
So you don't have to cut too deep in one of the sides?
You might be able to actually remove less material, by doing it on the side opposite the Knob, because the piece you have to make room for is smaller then the valve knob on the other side.
I'm just making an assumption based on what most k-valves look like.
They make one like that that has areas cut away, like we are talking about.
Rick