When my sight glass hit the window, I took the sight glass out and replaced it with a flat piece of plexiglass. I flattened out the spinner, and shortened the spinner axle. This created plenty of room for the window glass. It didn't look bad at all. If you didn't know it wasn't supposed to be that way you would never guess. This was a desperation move as the pump was shipping out the next morning, and I had never had it together with the window in it.