r3tic

I havn't cloned that species in particular, but it shouldn't be much different from other cacti. Cut the branch off, let it dry for a couple of days to callus over. Stick it in some lightly moistened sharp sand and wait. don't over moisten the sand as it will cause rotting. As far as timing, whenever it is activly growing would be best. Good luck and let us know how it goes.