Sight hole for DIY signal mirror

thingiverse

I craft a reflective surface using an old 2.5-inch hard drive casing, transforming it into a compact, functional mirror with ease, requiring minimal tools and no adhesives. By carefully applying heat to the drive's surface, the parts click together effortlessly, leaving nothing more than a few gentle burns in their wake, but the assembly itself remains intact without so much as a drop of glue being necessary to hold it all in place.