I’m wanting to make a window Cue. I’ve rough cut my tube and sanded to 3000 grit on the inside. My I.D. is ~.975. I think I’m close to the dimension I see in this photo from Michael Webb, but I’m uncertain. I’m hoping to make the window clearer than it is. I seem to remember reading about using a compound on the inside ( like Meguiars/mirror glaze). Any help would be appreciated.