I have noticed that the iron tends to shift a bit during long sessions on the shooting board, when the work is off blade centre. Easy to forget to check! The actual adjustment seems more easily done with a screwdriver just behind the mouth, there's little leeway at the rear of the body. However the setting can creep, even if you (over) tighten the centre bolt to the point where the lever cap can't be undone.
Has anyone drilled and tapped a No 9 to take grub screws to control lateral position, as LV do on some planes?
Has anyone drilled and tapped a No 9 to take grub screws to control lateral position, as LV do on some planes?