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Difficulty: MediumSequential Steps and Chronology

Read the following instructions for restoring a vintage mechanical typewriter:

"To restore a manual typewriter, start by removing the carriage cover to access the internal gears. Next, apply a grease-dissolving solvent to the segment slot, but only after inserting a protective paper shield behind the typebar basket to prevent solvent from dripping onto the wooden base. Once the solvent has completely evaporated, use a brass-bristled brush to clear away any remaining rust. Finally, apply a single drop of synthetic oil to the carriage rails; however, this lubrication must not be performed unless the drawband tension has been adjusted first."

Based on the guide, which of the following steps must be completed immediately before lubricating the carriage rails with synthetic oil?

  1. Adjusting the drawband tensionAnswer
  2. B
    Clearing away remaining rust with a brass-bristled brush
  3. C
    Inserting a protective paper shield behind the typebar basket
  4. D
    Removing the carriage cover to access the internal gears

Answer

Adjusting the drawband tension
The guide states that the final step, lubricating the carriage rails with synthetic oil, must not be performed unless the drawband tension is adjusted first. Therefore, adjusting the drawband tension is the step that must be completed immediately before the lubrication can take place.

Step-by-Step Solution

1
Locate the target action (applying synthetic oil to the carriage rails) in the text.
The target action is identified in the final sentence of the passage.
This sets the reference point for determining the sequence.
2
Analyze the conditional constraints associated with this target action.
The text states: 'this lubrication must not be performed unless the drawband tension has been adjusted first.'
This establishes that adjusting the drawband tension is a mandatory prerequisite that immediately precedes the lubrication step.

Key Concept

Identifying conditional sequencing and chronological dependencies in instructional guides.
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Topics

Sequential Steps and Chronology

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