Make a Prop Shaft Adapter using Nested K&S Tubing

It has happened to many an electric modeler: you have a motor mounted in your airplane with a small metric-size output prop shaft, and the propeller you want to use has a larger shaft hole than the outside diameter of the motor shaft, and at the moment, you don’t have a prop mount for a small metric shaft. Here’s a way to make a custom sleeve out of concentric, nested K&S tubing sections. The technique...