https://drive.google.com/drive/folders/1-KTznIHZ19NRtmu3c3iP2X_9P2GfM0ES (opens in a new tab)

• Axis 19mm Mast step
  https://autodesk4869.autodesk360.com/g/shares/SH919a0QTf3c32634dcf9cf120808d834c6a (opens in a new tab)
  @pacificmeister
• https://grabcad.com/library/quick-mast-connect-slingshot-flex-mount-6374-1 (opens in a new tab)
• https://www.printables.com/search/models?q=toroidal+propeller (opens in a new tab)