In case you want to try, I made a few closing loops with double ends. You’ll need only a longer piece of line and the same fid or wire tool. Finger trap a loop on both sides and lock them in place using Jump Shack’s sew less technique (see link). Make sure you respect the dimensions on the instructions. Tie a knot at the same length you would do with a standard closing loop. You can actually tie 2 knots at the same distance from both ends. Install in the rig. If the loop breaks, just flip the washer to the other side and you have a new loop right in hand and ready to be used (no need to run to your bag to look for another one). I would post a picture but the rig is packed right now. http://www.sidsrigging.com/...hless_fingertrap.htm
Absolutely right, thanks. Actually, I have never waited for a loop to break before replacing. When it looks too fuzzy…it’s gone. I was too lazy to write the full sentence and ended up passing the wrong message. Another thing I should add is to take care when storing the excess loop. I usually tie one or two other knots to reduce length and insert it behind the grommet.
The loft at Skydive Chicago has been using 1000 pound Flat braided Dacron, and I'm amazed at how long it lasts. I've seen their closing loops last for more than a year, used by jumpers doing 300 jumps.
If I see 1000 pound flat dacron, I very rarely replace them during repacks, while if I see other materials I will replace on every repack.
The flat dacron stuff works amazingly. The word needs to get out.
It is a little confusing just what Jump Shack uses.
In any case, heavier braided dacron closing loops can be really nice -- just from personal experience. The dacron isn't as slippery as spectra, it seems to wear better, the loop doesn't get as 'soft' as spectra does when it wears, and the loop has more strength than the usual type IIA sleeving (which is actually nylon).
I'm also not sure about the Jump Shack stuff. I've tried the type IV nylon sheathed line -- I think that's the type IV Jump Shack refers to. Ironically I don't even see it in their own on-line rigging supplies shop. That line is quoted as 750 lbs, but one pulls out the internal strands, with the strength of the sheathing being unclear. It's not in Poynters as best I can see. It is still a heavier closing loop than the usual type IIA sleeving.