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In an oral history for the American Institute of Physics recorded in 2005, Dr. Gingerich recalled that when he was about 9, his father brought home a book that had instructions for making a telescope, which they proceeded to do, using a mailing tube and lenses his father got from the local optometrist.

The length of the arm is made out of a mailing tube, with holes cut into it to reduce weight.

They built it using parts such as a SkyWalker X8 mini airplane with an Ardupilot navigation, a Quantum RTR Bomb System, a mailing tube and other 3D printed parts.

In this case the test tube was plugged with cotton and inserted in a wooden mailing tube to exclude the light.

This is a mailing tube—you know those mailing tubes that you can buy all made, of different sizes.