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With 9 mm offset, the cylinder portion of the 2.2x8.5 mm drill does not engage to the metal sleeve of the guide at #28 after pointed drill (Fig.1). This issue could be solved with 12 mm offset, although it has no ill effect in this case. Lab's explanation.
Xin Wei, DDS, PhD, MS 1st edition 07/29/2019, last revision 07/31/2019