Soft shackles work so well, many people are worried the noose will slip off the head, since that is the only thing keeping it in place. A standard button knot soft shackle has the legs completely separated until the noose but John Tucker wanted to try to test brummel splicing them together which, in theory, will keep it snug up around the knot.

John Tucker used Samson SK75 7/64 (2.5mm) 8 braid Dyneema. I pulled with the knot in different positions to see if we got the same results regardless. I pulled it with a hydraulic without any pretension until ultimate failure.

Our blog with the data https://www.hownot2.com/post/selfclo...
John tuckers splicing video    • How To Make A Soft Shackle  
Are tapers really that important?    • Are tapering splices that important i...  
How to tie the button knot with tests    • Tying a button knot soft shackle WITH...  

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Will this slip off
01:08 What makes these softies unique
02:08 Diameters
03:46 Different bury lengths
05:17 Knot variations
07:40 Long bury & big knot
08:22 Long bury & button knot
09:14 NO bury & big knot
10:03 Short bury & button knot
10:55 Our results
11:44 Off brand's don't break the same