I love a good glow plug debate! I tend to disagree that an idle bar plug is only for those who can't properly tune an engine. Clarence Lee then would fit in this category of "can't properly tune an engine" as he has upon occasion recommended an idle bar plug. That being said, I ONLY use idle bar plugs. Never had the bar come off and they work on every engine I've owned. Do they rob my engine of power? I don't know as I am only interested in sport flying so I do not try to get all out power. Do non-idle bar plugs work? Yes, but I do have some old engines that only like idle bar plugs. I use Fox idle bar plugs exclusively.