Thread and adapter for GP-5 Gas Mask

This is an adapter and thread that fits a GP-5 gasmask filter thread. The Thread file is for you to create your own designs. The filter1 file is to use with the goliath rotor styled filter files and will replace the rotor_shaft piece (https://www.thingiverse.com/thing:1843575)
Resize the rotor_body and rotor_side to 150% for a perfect fit.