Make the ending answer the story's central pressure - Paper 4

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Original writing brief, 'Damaged model': a pupil breaks a borrowed model and sees its maker searching for the missing piece. Recurring detail: a small wooden wheel. Possible ending: 'I need to show you something.' Write a complete short story centred on the decision to admit responsibility; later consequences may remain open. The supplied sentence is a model, not a compulsory quotation.