Hi Stewart, you have to use the "\once \overide..." _right_ before your "\mark ..." - no other notes, rests etc. in between.
This applies to "\once" in general. The "\once \override..." has to (wants to) change something right after, if there's nothing to apply to (e.g. Notehead, Stem, TextScript, Script, RehearsalMark, whatever...), it will be wasted. In your case, the "\once \override..." will _not_ be preserved until the next occurrence of a rehearsal mark. I read about this somewhere so I think this is by design. Example: This will work... a1 \once \override Score.RehearsalMark #'self-alignment-X = #right \mark \markup { "Markup" } | ... this won't! \once \override Score.RehearsalMark #'self-alignment-X = #right a1 \mark \markup { "Markup" } | I attach a example file you may find useful with some functions and variables I use regarding volta bracket / rehearsal mark placement. 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