This got kinda wordy..sorry. Bear with me...
Been working on my suspension system tonight, since my last bit of material came in early (!!!), and stumbled upon an....unorthodox use for double fisherman loops.
Basically I made some loops to hang my mock up hammock to the SLS suspension I'm working on, but found of they were too short to use with a larks head and a toggled bight.
What I did was open the double fisherman, so I have a loop with a piece of cord going between the 2 knots. I inserted the end of my hammock, and cinched the double fisherman down around. One side pulled the bottom tight, the other the top. When I got them tight, I had my hammock secured with a loop long enough to be used for a toggled bight. See attached image for illustration.
I did have one "failure" when it slipped up my hammock and pulled the whipping off, but I put that more on placement than an actual failure. I've done the same with a larks head. (my whipping also isn't super tight so it can be easily undone on my mock up)
Once tightened down, the knot was very difficult to loosen, meaning it was cinched securely (unlike a larks head). I didn't do too through a test, but I laid in a gently rocking hammock for about an hour with no issues.
I can see using this on a cinched end hammock, if you don't want to trust the stitching. A line of cord cinching the hammock material would make an excellent "stopper" for this, and it could be tied to put little stress on the stitching.
I don't feel like this puts any extra, or undue, stress on the cord.
Let me know what you think: good, bad or ugly.