Proton Pack HGA

A full size, 3D printable model of the HGA device on Ghostbusters proton pack. It is presented as a two part piece to cut down on print
times.

This part is modelled on Steffan Otto's plans at:
http://www.gbfans.com/wiki/Stefan_Otto%27s_Prop_Plans

Fit and glue a M8 to the base, and then glue the base into the HGA
tube. Mount the entire assembly onto the proton pack gearbox.