Door Knob 3 inch

This is my take on the Estes Door Knob. Designed to use a 3 inch shipping tube from staples. I have included the open rocket file. This rocket has been flown and works well with a F42-8. The lugs are for an 8020 rail which I will achnowledge not many people use but it's my favorite for mid power rockets. If there is interest I will update with other lugs.