SP9 Knob Calibration

If one of knobs on your SP9 head has become loose and is out of calibration it can be corrected without any parts, just a screwdriver.

There is a cinch screw in the center of the knob that can be tightened.  Pop off the center domed cover on the knob and you'll see the brass mechanism. If you engage the slots on the brass you'll be able to rotates the stem with the knob.  Tighten the screw gently and once the knob is slightly snug, center to the rotation so the pointer reaches both ends of the scale and then tighten further.

Replace the center domed cover and you're done.

You can also find instructions on page 32 of the attached service manual.