OK, thanks for the responses.
My current pre-amp makes a loud pop every time I move the selector on it, which is why I raised the question on the Grayhill.
I still think that I will order the Grayhill with the lugs. I will likely replace the volume pot with a stepped attenuator, which means I will need to drill lower on the faceplate and would like the knobs to line up. I just plan to bypass the balance.