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Editing Step 7 —

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Screw circuit board into bottom of plastic case

Place D-battery into battery clips

Screw top onto plastic case body

Do not over-tighten as this could cause the uneven pressure load along the perimeter and thus bowing (outward bending) of the top that affects the distance between the glass beaker and the magnetic rotor.

Device Inspection

The unit should be completely sealed, but without over-tightening of the screws used to attach the top surface. There should be no entry points into the unit other than the holes cut for the indicator light (if used) and for the speed control knob.

When turning the unit on, with a working battery in place, the LED indicator light should turn on.