The laser harp tower consists of twelve mirror assemblies and each assembly consists of five parts. Two brackets slide into the square mount and a 1" x 1" mirror snaps into place. To prevent the mirror from sliding out of the mount, two C-shaped joints slide in over the mirror. No glue is required for this assembly.

These 1" x 1" mirrors aren't the best quality, but they worked well enough for the single reflex between the laser and photoresistor.