I use a combination of hammering and pulling off I think.... I've never really thought about it....
I know I did some of that in a youtube video that some people commented on before
http://www.youtube.com/watch?v=_Pdz1ypJBkw
right around the 40 second mark I think.
It's a combination that I haven't really thought about before. But I'm sure if you transcribe it it will make sense.
I normally just work on those things very slowly and concentrate on what combination of left and right hand technique feels the smoothest. then I commit it to my subconscious and that's about it.
Easy,
Janek