Today I experimented with this technique on a low-angle flow near Leavenworth. I was NOT in any hurry to get down, and I HAD other rap options, but I thought I'd give this a method a try. I built a horizontal V-thread with a 17cm screw, and threaded my single 10mm rope through it. I realize that this method is intended for skinny half and twin ropes, but after a little trouble grabbing the rope with the hook, it eventually pulled through. I then rapped as usual, wondering if the rope would freeze with temps in the low 30s and some water dripping. It didn't, and pulled flawlessly. I probably would NOT do this with a 10mm rope in a "real" situation because it could be time consuming or impossible to thread is fat of a rope. I got lucky with a near perfectly aligned V-thread, but this does not always happen. The ice was bomber, and I had no doubts about safety in this case.