Hey all, after some recent comments out on the crags I thought I'd share what I've been doing for ages ...
http://www.youtube.com/user/blanchie14c I have been red marking my screw gates for a while now with a bit of red insulation tape. As you can see from the attached link, a inch or so of red electrical tape
or 4mm wide> is stuck to the crab so that when the screw is done up, the red tape is hidden beneath the screw body. The idea is to provide a visual system of easily seeing if the crab is done up or not. We’ve all done it – stripping a belay only to find a crucial screw gate wasn’t even done up! I also tend to be sat around at the top of crags and get that thought in my head that says “is that screw done up?” a quick glance and not being able to see the red tape tells me the screw is indeed done up. The tape is as I said, about ¾ or an inch or so long and 3 or 4 mm wide. It doesn’t go all the way around the crab as the cut away for the gate is there. A drop of super glue at the very ends stops any chance of the ends lifting up. It doesn’t interfere with the operation of the crab at all. I toyed with the idea of putting green tape on the other end so it would be green tape = crab screwed up and red tape = crab undone. A couple of problems with this, firstly on some screw gates there isn’t room for the screw body to smoothly screw over the top of the tape in the unscrewed mode and secondly, just as red implies danger, green implies safety. No climbing is ‘safe’ 100% so perhaps better not to possibly get complacent about being ‘safe’. A search on the net I did at the time showed that Petzl had already produced crabs of this nature but they don’t seem to be available in the UK. They are called Red Alert crabs and the red indicator looks to be a spot of paint in a dimple under the screw body, other countries have them as the Petzl locker or Attache...
http://www.shopwiki.com/_Petzl+Locker+Screw-Lock+Carabiner?o=426621389&... Just a little something that you may or may not want to play around with, I like it - its simple, cheap and effective!