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.....What happens if you have only one and the necklace breaks during a dive ?
what @SleepySlipper said. Doubling that bungee is going to be a right PITA. I've had the knots come undone on some borrowed ones before and you just pause the dive, retie it *may be ugly if you have thick gloves on*, and keep on going. It's not a bungee that's ever really under load though so if it passes predive inspection it shouldn't ever break.
In my case I zip tie the necklace.
Also, if it was to break, not sure I could redo it with gloves.
Yes it is under the mouthpiece zip tiewhy zip tie? or is it under the mouthpiece zip tie?
I’ve never once seen a bungee necklace break.
use the same zip tie for the mouthpiece and crank it down. Ain’t goin nowhere.