This article looks to be 15+ years old. The cam pictured in Fig. 1 looks look one of the earliest models of SLCDs, from sometime in the 80s when cams were all r

This article looks to be 15+ years old. The cam pictured in Fig. 1 looks look one of the earliest models of SLCDs, from sometime in the 80s when cams were all rigid, if I remember my climbing history correctly. If you follow the link to the home page, you can end up on a page that refers to more recent work having been done in 2005. http://web.mit.edu/custer/www/rocking/rocking.html http://web.mit.edu/custer/www/rocking/rocking.html