Get a sewn runner, which is a strong loop of nylon that is cut various lengths. For half dome, it probably wouldn't hurt to get at least a 24" runner so that you have some room to work.
Get one of the cheap, but unused climbing harnesses from a web site such as sierra trading post.
3 Locking carabiners per person will do the trick. Jumbo biners are easier to open with one gloved hand but the biner locking the harness to the runner need not be jumbo. One biner locks the harness to the runner, and the 2 jumbo biners lock to the cable.
Clipping / unclipping won't take long and you really don't want to rush this part of the hike
buy some gloves with sufficient padding/protection -- you will be gripping the steel cables as if your life depends on it..
Has anyone used a screamer for their climb? A screamer is basically a heavily stitched runner that has been designed to reduce the energy sustained during a fall so that you don't break anything or really hurt yourself. I just wanted to know under both scenarios - cables down and up - how quickly one could actually "fall" down half dome and whether the investment in a screamer was worthwhile.
Since we're on the subject of half dome safety -
Is it unethical to clip yourself to the cables when they are down?When the cables are down, and you *fell* during your climb while clipped to the cable, you'd slide down to the end of that section of cable, right? If so, you'd save your own life, but could potentially be responsible for killing anyone below you who is sharing that section of cable and isn't secured to it because you will collide and likely send them down the side. So, is it unethical to lock yourself or should anyone attempting the ascent with downed cables be responsible for anything that could possibly happen? I could see the media and California judicial system holding one accountable for this..
When the cables are up, and you fell, I guess your fall would stop at the next pole below, but there is a possibility that the pole could come out of the granite because it isn't cemented into place. I wonder what the odds are that this happens as well.