In reply to misterb:
I must have abbed off the gear in that photo last October when we were on top of the Puro. I'm an easily scared, middle-aged, family man, and didn't have any concerns whatsoever in abbing off any of the fixed gear that we found in Riglos.
What the photo doesn't shows is what the rest of that big wire cable is threaded through. I'm pretty sure it is some substantial bolts that you actual use to ab off. This cluster is, I think, just a sort of makeshift handrail for the very cautious from the very top of the Puro guiding you a couple of metres down to the ab runway/station. All good sense really since you want a clean vertical descent that will return the ropes without pulling any loose crud down on your head.
It's not the gear you need to worry about on El Puro, but other climbers. We were the first party up that day, with about six parties behind. We dislodged not a pebble during the abs, but on the descent saw clumsy oafs knocking some pretty large rocks off and nearly wiping out spectators on the track below...
Tony