Related Clues:

• Not moving like a cannonball
• Hands a draft that needs to be revised and fixed
• Strict stand had RAF all at sixes and sevens
• Inflexible, as a rule
• Fixed, as nails? Quickly too!
• Inviolable, as a rule
• Like a game show’s lightning round?
• Immutable, as stone flying through the air, perhaps?
• As flying nail, for example, set in concrete