To the author of said snippet lsr.di.unimi.it/LSR/Item?u=1&id=1118 Thanks for your snippet.
Though, wouldn't it be much more elegant (and shorter) to get rid of the stencil-override by setting `systemStartDelimiter` and simply adjusting some other stuff? Leading to: \version "2.18.2" \layout { \context { \Score \override SystemStartBar.thickness = 1.8 } \context { \StaffGroup \override Clef.X-extent = #'(-0.4 . 0) \override SystemStartBar.padding = -0.65 systemStartDelimiter = #'SystemStartBar } } \new StaffGroup << { c'1 } { c'1 } >> Best, Harm