Take a short wrench and it would be hard to over tighten the nut. Take some super glue and put it on the threads and it will stay tight for a while.
By Joseph Stover From: Chistchurch, New Zealand Jun 25, 2006
I forgot to bring a wrench today so the 4th bolt may still be loose. I won't get a chance to go back for at least a month or so, so if someone plans to climb this route, please try to tighten the bolt.