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Why and How to make an easy RF choke

If you can't see the video, please insert this title URL into your browser search box:  https://www.youtube.com/watch?v=gl_aByCV8KQ . This is post 2227 in a continuing series of simple ham radio antennas. Here's a handy and often necessary device to help you control common mode currents and other interference coming from a coaxial feed line. In this video, the "Radio Prepper" takes us step-by-step through the design, building, and testing phases of a simple RF choke.  Here are some of his observations: "For just a few Dollars to boot... An RF choke can save the day for field radio operations where you do not necessarily control all aspects of your antenna system and common-mode currents can wreck havoc on electronics, and even your fingers! Use an FT-114-31 with six turns of RG-174 or RG-316. You can also use eight turns with an FT-140-43. For more power handling you can use an FT-240-31 or FT-240-43 but I do not know the number of turns (RG-402). Do not