Keep the useful parts
Revision r2 changes exactly two prints: the tilt carriage and the servo cap. The head, fixed cheeks, linkage, pan mount, and base all stay. Both revised parts are now in the complete current hardware package.
Locate the case, then clamp it
The servo needed a proper seat. Low rails and front and rear stops now locate the case, and a wider T-shaped cap replaces the narrow original strip. In the model, the cap touches the case before it reaches the screw pillars, so tightening the screws clamps the servo instead of leaving a gap above it.
Give the arms and horn room
The arms grow from 7.4 to 8.6 mm wide, with broader roots and exposed nuts in place of hexagonal pockets. There is new relief under the single-arm horn and beside the lower rod eye, so the moving linkage has room. The cheek mounting positions don't move, so nothing else has to change.
Still owed: a fit check
All of this comes from nominal CAD dimensions. It doesn't prove that a printed part is strong enough, or that every available servo fits. My own revision notes say to check case seating, fastener engagement, and free movement before opening up the motion range.
