Head introduced a new technology called "Teflon Grommet" on its new version of Extreme line. Head claims Teflon Grommet can reduce the friction between strings and grommets, thus creating lower energy loss, higher power and better sweetspots. I am wondering if we can just achieve that just by using the widely-available Teflon tube? Just as shown in the video below http://youtube.com/watch?v=040W5r8F04w&fmt=18 Besides, does Head's Teflon Grommet work well? From the only two TW feedbacks, it seems to suck.