Related Clues:

• Back in good health, add new parts
• Row about defensive facility put back later upgrade
• Modernize, maybe
• Equip with new parts — bent lever ultimately lifts it
• Characters in riot fret about something modern being introduced
• Engineers needing time with advantage not initially getting extra component
• Make backwards-compatible
• Install new parts, strong girder finally put up over it
• Upgrade, as aircraft
• Substitute new parts for old
• Make less vulnerable to earthquakes, say
• Keep interrupting row about updated component
• Modification made after manufacture
• Update equipment, in a way
• Add GPS to a Model T, e.g