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Electric Vacuum Pen From Aquarium Air Pump.

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Step 19: Put The Diaphragms Back On

Slide the diaphragm swing arms back into their sleeve.  The magnet may pull it some towards the motor, but no harm if it touches in the process.  But it shouldn't be touching when it's back into place.

Alternatively, you could put the diaphragm back onto the white valve before you put them back into place and slide them both back into their sleeves at the same time.
 
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