(Brainstorming) DIY Handheld Scuba-Object Retainers

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One other clever idea, which seemed to work. The knot on the left was the target-size, used for securing the top of a side-mount tank. The band on the right is the "adjustable" loop.
  • Double-wrap the paracord twice as described in Type 2 above. Clamp, but only enough to close the hog-ring, not enough to squish the paracord.
  • Repeat previous step slightly farther down the paracord.
  • Adjust the paracord through the hog-clamps until it's relatively even.
  • So long as the rings are next to eachother, it shouldn't slip at all
To adjust the size of the loop:
  • Pull through relatively even amounts of cord. (Phallic shape optional.)
  • Move lower ring up next to upper ring.
  • Optionally trim excess, if desired.
An adjustable knot might make more sense here, but I was having fun with experimentation. The problem is (1) you have to be careful to not-over-clamp and (2) doing two rings definitely ups how time-consuming and messy it looks. A proper knot probably wins this round.

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if you're making loops, particularly adjustable ones, then tying prusik loops is the norm
Prusik Knot

That's a very clean and simple looking knot. I knew such knots existed, but had no idea what they were called, thanks for the pointer!
 
Prusik Knot

That's a very clean and simple looking knot. I knew such knots existed, but had no idea what they were called, thanks for the pointer!

multi use, most common use in diving is as a regulator necklace since the open bit can clamp on the regulator mouthpiece orifice. We use them in technical diving for all sorts of things, similar to why they are so common in mountain climbing. Very versatile
 
multi use, most common use in diving is as a regulator necklace since the open bit can clamp on the regulator mouthpiece orifice. We use them in technical diving for all sorts of things, similar to why they are so common in mountain climbing. Very versatile
For clarity, the loop we're talking about is not made with a prusik knot. It is made by tying a double fisherman's knot with the two ends of the cord or bungee. This type of loop is what is used to tie a prusik onto another rope (like for climbing) or in the case of a reg necklace you tighten the mouthpiece inbetween the 2 halves of the double fisherman's knot. In the case of a wrist loop, you just tighten the 2 halves together, or if it's too big, pull them apart to tighten the main loop.
 

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