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Electric Vacuum Pen From Aquarium Air Pump.

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Step 9: Replace The Gasket Rotated 180 Degrees.

Picture of Replace The Gasket Rotated 180 Degrees.
Place the gasket back over the peg but this time rotated 180 degrees and using your new hole you poked.  Don't worry about the old hole, it won't be an issue.

Again make sure to do this for both sides.
 
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