Cavendish Experiment

I am a U.S. service member currently assigned to Daegu Korea, away from my family for a year.  As a way to occupy my time I have decided to build my own Cavendish Experiment.  I have been building it for the past 5 months, providing updates to my YouTube channel.  I am getting closer and closer to having an operational experiment that hopefully will have all variables removed.  The last parts I need for a truly successful is a scientific laser and silvered mirror, for taking accurate measurements of the experiment.