Heat shrink takes care of the metal contact on the paint. I say to each their own, but it's my method of choice nowadays. With my son, two of my students, and my wife having ported sticks, I get to do my fair share of 'em. As a result I've gotten to be pretty smooth with the procedure, and I use two s-hooks; one for each side, so there's no switching like in the video.
Anyway, this was meant to give the op another option besides the boomerang or the 50/50. I not suggesting it's superior to either, it's just...different, but very effective.
Need help finding lost dog: walks with a limp, recently castrated, can only see out of one eye - answers to the name, "Lucky".