To replace the adjustment knob screws:
- Insert a 2 mm hex wrench into the two (2) openings behind the adjustment knob, and press outward to pop off the cover.
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Use a 2 mm hex wrench and remove the existing screw. This screw can be discarded.
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Use a 2.5 mm hex wrench to install the screw and two washers. Hold the knob stationary to tighten the screw.
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Reinstall the knob cover by pressing it into place.
