In reply to Chris Craggs:
There is a climbing shop in the main street of Callbato but it has never been open when we have been there, I guess it will be open weekends but... The Montserrat Free Climbs guide is very good but very much a selected guide. I have a copy and could scan a couple of pages but don't have the Cara Sur guide. Are you looking for single or multi pitch? Some great 6a, 6b multi pitch but, as I know from experience, it is a very complex area and approaches are not always obvious.