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Most people do not realize that a .001” (one thousandths) increase in a jet or air bleed, changes the volume traveling through that passage by approximately 5 to 7 %, which is huge comparative to the size change.
Although we offer and sell a drill bit set, we strongly recommend finalizing these sizes with new jets and using a reamer. The drill set is an economical tool for making changes and establishing a jet/pilot package that best suits your application.
With the substantial effect of a .001 change, drill bits have a tendency to leave burred or spiral cut passages. Drill bits will not offer a consistent/smooth passage size with repeated use, and will cut larger and larger as the drill becomes dull.