Here's Part 2, which shows making the screw holder, prop holders, and the tension spring. Update: After some more flying sessions, I am now using .011" music wire, 4 1/2 turns, for the spring, the .012" wire shown in the video still gave too strong a spring.

For the stuff mentioned in this video:
https://www.cstsales.com Rohacell 71 IG foam and unidirectional carbon fiber, 1.5 oz per sq. yd.
https://www.microfasteners.com/ 0090 nylon screws, 0090 plug tap