I searched for a while to find "the best" AAA mini light, and while it isn't "the best" at anything, the Ti3 is such a great balance of compromises that I settled with it.
I use mine as a neck light, as a small necklace that I wear pretty much all of the time.
I started with a lashing to hold a cord in place but switched over to a different system which isn't as safe (with the lashing there is no danger of strangulation because the smooth ends of the cord will pull free with sufficient force), but I found that using a short cord with a slip knot tied on each end is very practical for making the light into a necklace.
The small eye hole isn't used at all.
I put a half inch of heat shrink tube on the end to make the light bite friendly, but that wears out and I ended up grinding anodized aluminum with my teeth, which is no good.
A friend whom I'd given one of these Ti3 neck lights to discovered an improvement, which is to heat a small section of clear poly tubing and stretch it over the end, much more durable for holding the light in one's teeth.
The Ti3 is light enough and small enough in diameter to make it easy to hold with my teeth for the duration of a task, and easy enough to talk at the same time, kinda sound like a cigar chomping gangster but anyway it's intelligible speech.
The two slip knots allow the cord ends to come off of the light to the left and the right, so the necklace tends to remain straight rather than twisting, as will happen if the ends come off the light from the same side.
My favorite thin about this simple system though is that by taking the necklace off and tying a third slip knot in the middle and giving it a generous slipping loop, I can put it back onto my head like a headband with the Ti3 pointing down on my forehead, cinch it up right and it makes a very light weight headlamp, angled perfectly for reading, or other work position tasks at arms length and waist to chest high, or for walking.
I can position the light higher on my head for something closer to a horizontal view but holding the light with my teeth is much more practical for that.