Is this safe to work from

Treemann, if I were judging an event you wanted to use this in, I would request you put in a slip hitch and a carabiner in the loop of the slip hitch and around the standing part of the line just beneath your friction hitch and above the ascenders. Toothed ascenders can damage the cover of a rope between 1,100 - 1,500 lbs. of force, which wouldn't take much of a slip from the hitch.

How about using a Port-a-wrap to anchor the rope? Grigri's are nice for the comp., but not while pruning.
 
I agree with Norm about the porta. Why not? I would use a prusik to auto lock though.

As for the big wood damaging the line, sure that could happen. But, the line would be pretty tight to the tree, thus making it difficult to hit. Also, if you're saying that this technique is mainly for pruning then you shouldn't have too many big logs falling.

I'm more affraid of a ground worker compromising it.
 
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I agree with Norm about the porta. Why not? I would use a prusik to auto lock though.

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I agree with Mark about agreeing with Norm about the porta.

And, I agree with Mark about the Prusik. A Prusik should be mandatory if a P-A-W is used for belay.



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Also, if you're saying that this technique is mainly for pruning then you shouldn't have too many big logs falling.

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Not too many big logs, but lots of handsaw use. In an excurrent tree such as a pine, I worry about pruning a branch on the backside of the trunk and cutting myself out of the tree. /forum/images/graemlins/smilie_schreck.gif


I think systems like this can be really useful, but there are some inherent, hidden dangers. These systems should only be used by, or under the direct supervision of, experienced personnel.
 
It is the ART mini-block. The same one that comes on the rope quide. It is a threaded pin that also has a locking nut and a screw that secures the nut from backing out.
 
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