Yep, its you.......make sure you check it in the conditions you will be using it, not just in the livingroom, etc. The best way to enlarge the hole is to use the very small 'number drills' that often come in a 'pin vise' set. Just lay out the bits and keep trying them in the hole until you get a good fit, then start upsizing the hole progressively. The finger powered pin vise will cut the soft metal just fine. Upsize and try, repeat as neccessary until you get a clear view.
FWIW, many people try to use an aperture that is too small a dia. You need the right amount of light coming in, for your eyes, for the centering effect to work.