Posted by Annapurna croll and hand ascender. will use my rig or gri gri if my buddy can't rescue off a croll, though.
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While doing some electrical work on-rappel inside one of the big wind turbine towers I was working on, I found that the handled ascender w/footloop & Rig combo works pretty well if you're not jugging up hundreds of feet of rope.
You Rig down to where you want to be, and if you have to move upwards you just hook on the handled and slide it up, then when you stand in the footloop you pull the tail through the rig and sit back down on it. Pretty easy. Worked really nicely for simple up/down adjustments.