SFIC Control Line Torque Tool
SFIC torque tool for picking to control line.
This torque tool has three little "fingers"
spaced to fit the holes at the bottom of the
control sleeve, which effectively puts torque on
the control sleeve but no shear force at the (inner)
operating shear line. The fingers are long
enough to engage the control sleeve but not so
long that they protrude into the holes in the shell (which
would prevent any rotation).
A conventional torque tool can be modified to produce this
tool; commercial products are also available. Note that
different thicknesses and widths are required to fit the
various SFIC keyways, and shims may be required in the
keyway to get a proper fit and good leverage. The only
commercial maker of these tools of which I'm currently aware
is Peterson Manufacturing (shown here is their "thin"
SFIC tool). I believe the design was originally due to
Image taken with a Nikon D-100 digital camera with a Nikkor
85mm 1:2.8D tilt/shift macro lens (with Kenko extension tube).
Lit by electronic flash and various reflectors.
Copyright © 2003 by Matt Blaze. All rights reserved.
You may not copy, modify or use this image for any commercial or
non-commercial purpose without permission.
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