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i think of the double eyed split tail friction hitches we use as all very similar; this giving a key to easily remembering them. They all employ a top coil (4 uninterrupted turns around host lifeline) that will give pretty sure stop, but too powerfully so might bind. So we precede them with another choking grab (except VT family uses a gauntlet of braids to bend lifeline like rappelling rack to not pass full loading to the coil) to limit loading to the coil and keep it in it's productive powerband of slide and grip without seizing.

These descend in DdRT and not SRT. For the hitch must be unladed to slide smoothly. The load switches to the saddle termination leg of DdRT, as you slide hitch on other leg of support. This works just like the hitch leg of support was failing or stretching, and the other line/leg takes the loading, thus freeing up hitch to slide. SRT doesn't have another leg of support to transfer loading too; so hitch tends to grab tighter, rather than slide in descend mode.