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Setting Micrometer Zero (0mm Needle stroke)
Indexing Air Cap 90° (Optional)
Rotate barrel using
key as a lever until the
horizontal scale is in
line with “0” on the
knob. Re-tighten
touches stop.
Note: Do not over
engage pins into
Remove Snap Ring holding Air Cap into
Retaining Ring with a small screwdriver
blade; assemble optional Indexing Ring
(SPA-112) onto the Air Cap by engaging
pins into the location holes.