Vintage Complete NATCO 16mm SOUND MOTION PICTURE PROJECTOR 3030-1 Working VIDEO

Description

I have a video of this playing. I took it apart to show the inside the only thing Im unsure of is what the red tube on the inside is for?? I dont have a film to test everything so SOLD AS IS parts I DO NOT do returns on a large heavy item with high shipping costs.   You can view the video here just copy and paste it in your browser   https://youtube.com/shorts/LvO3x3vJZ6g?si=FBPlYvFdhoBi1Bcw