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Using the lock jack is the same as most other mechanical friction devices, if you don't tether the running end of the line or abseil it the descent is jerky and not fully in control. You be going too... fast. There's very few mechanical friction devices I haven't tried out, with double or...

You can feather a friction hitch much better than a Gri Gri, and with one hand too. It you don't tether the end of the rope with the gri gri the descent will be jerky and not fully in control. Those mechanical friction devices work only so so. I'll admit better on single line than double.