Very interesting. I expect to make one of those this week. I already have the slingshot so shouldn't be too difficult. Was actually considering this for squirrel hunting while I was out, but couldn't think of a good way to make the rest in the field. My guess is I could fare much better on squirrel with it.
"Stainless swivel" I could not see this clearly in the video and although I fish some I have only fly fished in the last decade or more and was unfamiliar with the nomenclature. I guessed it was one of these
and that does seem to be the case.
not sure if it is legal in Ohio.