Check out ibuildit.ca
He has made a vise from a screw jack, and has some videos of it in action.
While I’ve not built his vise, I have roughly followed his instructions for other projects, and I think he really suggests things that actually work (not just “content”)
There is value in just using something like this to break spending habits of the population.
A lot of people may find that a portion of their spending wasn’t that necessary after all, and will stop beyond the boycott. The businesses will need to improve services or lower prices to win customers back.
At least, that’s what I hope this achieves. The organizers might have varying goals.