Wonderful link. I helped a lot but a little bit late!! I have already bought my skates and the rocker system is not available.  But this is not gonna stop me from practicing grapevine!!
Thnaks a lot for the documentation and valuable information.
Regards
Alireza

--- In iranianskaters@yahoogroups.com, "Fariba" <fariba_fathi@...> wrote:
>
> about rocker system visit:
> http://skate.persianblog.com/1381_10_7_skate_archive.html
>