I did a little research and am not so sure this guy made the mkIII version. Perhaps the mark I.
Anyway, if you'd like to ask him something about Audio Innovations you can try contacting member "Erik Andersson" on this forum: http://www.hififorum.nu/forum/default.asp
Don't know if I explained so well.. that screw (if your RS-A1 has one) is on the underside of the arm base, and is only an internal connection between arm "pillar" and base I think. Not for connecting an external ground wire to the phono stage.
Anyway, if you'd like to ask him something about Audio Innovations you can try contacting member "Erik Andersson" on this forum: http://www.hififorum.nu/forum/default.asp
Don't know if I explained so well.. that screw (if your RS-A1 has one) is on the underside of the arm base, and is only an internal connection between arm "pillar" and base I think. Not for connecting an external ground wire to the phono stage.