lairdb
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SteveFass:Boogie - I still don't get what keeps the ring of rubber suspended in space. There must be more to it I'm not getting.
It's own tension. The "loop" is basically just a rubberband around the strap. It's tight enough to hold itself in place (i.e. just barely snug to the strap) when there's no light in it, and stretchy enough to pull out and over the light head to secure it.
If you peer closely at the straps on this picture from the BAUE gallery, you can see the innertube loops in their relaxed state. (The fact that they're black doesn't help make them visible, but if you peer closely, you'll see them, and you'll see that they're just tense enough not to slide around.)
I thought it was goofy penny-pinching until I tried it; it's actually a very elegant solution. The only trick is in finding the correct width for them; the wider they are, the less stretchy; the thinnner they are, the more prone to breaking. I found a sweet spot around 3/8" or so.