Originally Posted by FallisPhoto
As Rick says, the hardest part is cutting them down.
Use thinnest mirror you can find.
Use a carbide machinist's scribe. Place mirror on hard cardboard coated side down. Use a wooden ruler if you can. Scratch once
, and do it right once
preferably. Break immediately.
Tiny glass shards will scratch the coating so clean by dipping in isopropyl alcohol.
Clean up edges and shape to size by carefully rubbing with a piece of fine emery cloth.
Do not use cyano glue, it flows all over the place and is hell to remove. Use rubber cement or model airplane glue (the old fashioned stuff) or really thick lacquer paint (let it dry in a small puddle) Apply whatever with toothpick.