Re: SRT\'s
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The early caving systems used a foot stirrup with a Gibb's ascender sewn in. After a while some of the cavers were getting injured ankles from the cam being mounted on the top of the foot. When the stirrup was loaded this twisted the ankle. The next design was to keep the cam low and on the outside of the ankle. This is what the Pantin is derived from.
Here's what I've found for locating the P on your ankle. Think of the knob of your ankle bone as the center of a clock looking face on. The rope should exit the top of the P at about 3:15 or 3:30. In other words, just a smidgeon below and behind the ankle bone. Once you have the P located with the boots that you climb in take a stitch in the webbing to lock the foot stirrup in place.
The climbers that I've told about this have had less ropes popping out of the P and their ankles feel much better.
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I tried that Tom. It didn't work; the cam catches on the boot making entry and exit difficult, and it threw the rope too easily. I gave it a good chance and shifted it into lots of slightly different places. It also made my ankle cant over too much. It could be to do with the thicker chainsaw protected boots we wear.
I now wear it just behind the knob of the ankle in the hollow there. Its set so the rope runs through the cam just going over the ankle knob. I find this position very comfortable, keeping proper alignment of ankle and knee. The rope doesn't get thrown, the cam operates freely allowing easy entry exit of the rope and the shell doesn't interfere with jamming a foot in a crotch. You will need a boot that goes above the ankle, or ankle strap padding.
There is only one major drawback of this position that I have found; its so comfortable and forgetable, that if you loan it to your buddy who wants to give it a try, he drives off home still wearing it (seriously, its happened twice now!). Sorry, that makes two major drawbacks - driving with it on could be dangerous
Just my experience.