A known-straight, fully retained 1/4-in. hex bit traces a visible circle at no load.

A known-straight, fully retained 1/4-in. hex bit traces a 1. Remove the pack; inspect and clean a known-straight bit and its shank.

• FM-18: Fm 4 1 2

• root cause analysis
• tools needed
• step-by-step repair procedure
• diagrams
• exploded views
• post-repair checks

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