Pieces of the laser unit, prior to assembly. The laser module is a Coherent 5mW 670nm unit, with glass optics. It is designed to run off 5V, but is easily powered by voltages ranging from about 3-6V. This unit is powered by a single Li-ion cell at ~3.7V.
NOTE: To my dissapointment, at the final polishing stage, I lost grip on the piece and the polishing wheel grabbed it, processed it through the grinder and then across the shop. I removed the majority of the damage, but some were too deep to remove, without re-machining the part. A scratch is seen in this view. Some flat spots are seen in other views.
Acknowledgement: I wanted to thanks Don Goldman, (of Astrodon.com), for his suggestion of this device.