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It's the easiest thing in the world...all you do is grab one of the legs of the doubled rope underneath the ascender and pull/body thrust just like you would with a self-tending friction hitch. That leg pulls through the cam and then the cam grabs it, capturing your gain. The only drawback is...

jp, does Nick's post give you enough info, or do you want us to explore how this works a little more for you? Feel free to pm me if you'd rather.

Thank you both, gentlemen. Your kind words and encouragement are balm to the eyes of this old climber. You know how the saying goes, "those who cannot DO, teach". ;)

I did note the dinging, as you describe, but I found that it was basically cosmetic, so far as my trials have gone...could be a problem in day in and out use. Can you visualize a simple way to pad that interface? Maybe glue some leather to the bottom of the Microcender? I have one of the CMI...

I like it, Pete. I like it alot. I'd probably go for a different knot, like an anchor or buntline hitch to attach the second line, just 'cause the figure of eight knot locks down so tight when loaded, but that's a nothing quibble. I do think I'd miss the ability to body thrust the doubled...

That is the only aspect of this arrangement that I looked at with any scepticism. It would be an easy mod...but I'm really pretty comfortable with it the way it is. The distance of drop possible if a cam fails or the rope escapes the ascender is only 8 inches or so...as we all know well, one...

Wag, if you pull on one leg of the rope, either by footlocking it or intentionally pulling it ala body thrusting, the doubled rope loop above the ascender just gets smaller, exactly like DbRT. The backup has no effect in this, that's just the way the double rope ascenders deal with that scenario.

Nick, you can't splice EVERYTHING on the planet :lol:. The knots are not big, they are just the right size :). "To a guy with a hammer, everything looks like a nail" :P. Yes, in the couple of test climbs so far they stayed secured back to back...when I tested the backup function they...

What kind of ascender is it you're using?...this is hard to understand.

The ascender was slipping? What rope do you normally use it on? I've never had trouble with a handled ascender working fine on 1/2 inch rope. The microcender most certainly would perform well...perhaps a bit more drag than a distel, but it would grip for sure if you needed it to.

There are two seperate holes there, the bight is not tight. Even so, you think?

Specifically, I don't have one :D. You mean the Rock Exotica Dualcender?

Pete McTree and I have been trading some communications regarding backing up Kong double rope ascenders off and on for a while now. Recently we revisited the subject, prompted by his bringing to my attention a thread at Arbtalk reporting a fall by a climber using these ascenders. I'll include...