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Editing Step 49 —

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Place the tip of the mixing nozzle firmly into the hole of a propeller and the hole with potting compound until it overflows. There may be some air that needs to escape for the potting to fully fill the hole. It's okay for some potting to overflow onto the surface above the hole.

Using a rotating motion, press the propeller down against the motor shaft. You'll need to sort of screw the threading onto the shrink tubing on the shaft for it to go on all the way without scrunching the tubing.

Do these steps for all three motor bells and place them somewhere where they can point directly upward. A wire shelf or a crack made between two books can allow the bottom side of the shaft to be out of the way.