mechanical knot

You can use a steel Rr FS with an oval link in the eye of the climb line as a stopper. You can add a retrieval line of choice to the oval link. Something lighter in weigh than the climb line is nice (but not throwline), especially on taller trees, to prevent the normal mid-line stopper knot from wanting to back away from the small ring due to tail weight.
 
We do this at the tail end of a rope or lanyard with a splice or straight off with large RopeShield. It is knot midline attachable.
As your drawing suggests it is smooth and radiused for smooth bypassing of tight crotches,forks and obstacles plus with the ability to retrieve many ring on friction savers and the like. With my personal ropes and lanyards they are either knotted or with a whipped and stitched eye smoothed over with the RopeShield.

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It is an interesting tool with multiple uses and unlike the plastic or rubber will be a Life time tool!
 
Seems there are those who use the ring on ring fs to make the srt system retrievable (Oceans, JeffL, etc.) and those who use a system like lonniels above (or DBT's "pinto cinch", I think). If you are satisfied with the performance of any of these, I encourage you to continue! They all have a function and can be climbed upon, especially with proper planning of the climbing route (as Tom and Sirnick and others have said).

My point about the desirability of a mechanical stopper knot is a result of not being satisfied with any of these options. I think the oval link solution (Oceans) is not a good, permanent fix. I wouldn't want to be suspended off of a spliced end and an oval link, subjecting that same link to the loading of the small ring. Seems like a make-do solution (but one that does work!) Likewise, the butterfly knot bunched up against the small ring has problems: i.e, the "big fat knot through the tight crotch problem" (although with proper planning this might be avoided to an extent).

The mechanical stopper knot is the final piece of a completely knotless climbing system for srt (except for the friction hitch).
 
Thats right: a collet. But how will it be tightened? By means of a nut...that leads to how to thread all the rope through the nut to get to the piece (being installed midline). That would add a lot of hassle. Can a nut be installed mid-bolt? How to tighten the collet with a slim mechanism that is solid and load rated...? Somebody will suggest an answer...
 
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That looks like a strange way to load a carabiner.

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"a strange way to load a carabiner", ??? I was liking the way that looked. But now that you mention it... Are you thinking a good way to side load a carabiner? Or do you see something strange about the setup?
 
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Wade- With proper planning you can avoid getting your butterfly knot stuck in crotches entirely. I am having a hard time seeing any reason not to drop your pull down leg straight to the ground?

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I gave up on the cinch because of the difficulty of pulling the line out with multiple redirects, maybe the pinto makes that easier? I like the ring and ring but was then confronted with the issue of pulling a retrieval ball through redirect crotches.

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Levi: consider moving around through a big, multi-stemmed oak--or better, ash. With your ddrt and friction saver, you can climb quite aways up the other stem before needing to retrieve your friction saver and climb further up to tie in on the secondary stem. From that angle, if you are using srt with the cinch or with the stopper knot you face certain potential problems. How much would it suck to get your stopper knot stuck in a crotch on the far stem during a tie-in reset?

The whole motivation of the idea is to try to create a slender profiled mechanical stopper knot that will bump through the canopy with less trouble than a stopper knot and that will make use of existing ring on ring technology.
 
Alright, last call for the night. I've included a new drawing of the thing here with a ring tightened down on the collet. Its drawn rough again, and not exactly to scale. BTW, the only way this would be viable is if it proves to be lighter and more efficient than a stopper knot. It may knot be. It may be a big, heavy piece of aluminum that gets jammed into tree crotches. I just thought I'd push this thought experiment a little bit. I can't take on shepherding this thing through to production, but would gratefully hand it over to a manufacturer who could. Any further thoughts or suggestions are much appreciated.
 

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What about a system that works like a PulleySAVER, but it has a hitch to hold the climb line in place? To retrieve, it would be like unthreading a Rr, but there would be no retrieval ball, just an eye splice that makes the hitch back through the large ring. I'll take some photos today if I can work up the system. No stopper knot required, just an E2E, 2 'biners, a Pinto, and a hitch...the hitch would have to create less friction than the backbone of the FS on the branch. Might be more complicated than it's worth.
 
I can see that design working, you would have to thread the rope through but it makes sense in theory.
Can you explain the overall goal? I understand getting rid of the knot so the rope pulls smoothly but there is still a friction saver that is trailing behind to get stuck. Also it sounds like a lot of rope to pull just to move your tie in. Seems like you would be solving one part of the problem but not the whole thing.
 
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