Purpose: Put back through the key.
Requirements: - Tolerance high position, high level of copper cathodes.
- Dimensional tolerances low, moderate gloss, must have openings for easy moves latch.
- For example: O30 key selected in the exact level domain distribution supply hole 10 D, deduce the true size of the hole is 30.08 ÷ 30.18 mm.
the method worked: Drill + reamer.
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