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I don't think a false crotch has anything to do with the spiderjack self tending. As long as your using the right rope it will tend no matter the crotch. I've also found it was much easier to learn the sj when using natural crotches.
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Jeremy, finally someone that has likely used one and knows what he is talking about.
As far as self tending, you are pulling rope to the spider jack, it either flows through the spider jack or is does not.
It has nothing to do with the friction or lack of friction in the tie in point.
I have recently been using the spider jack 2 and didn't want to rant or rave about it yet, because it pisses me off still a bit right now.
I think once I find the correct biners so that there is not even the slightest non vertical alignment, it will help.
But I'm using 1/2" rope, which it says it acceptable, but i swear, half the time it will not self feed. i went to a new rope and it got better, but still won't feed all the time.
i need more time on it and i think i will get it worked out.
I did learn as I am hand over handing rope to it, if i take my fist of rope right to the spider jack, it helps a whole lot. Verses just hand over handing and not taking the hand smack up against the spider jack. If that makes sense.