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Editing Step 12 —

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Cut the syringe just past its plunger stop (the barrier inside the tube that the plunger butts up against when pushed in all the way) with a hacksaw. We want to keep the plunger stop in place so that the plunger can make a seal against it during dives.

We only want to cut off excess plastic (the part that a needle would normally screw into) in order to remove unusable length in the plunger.

Once the end of the syringe has been cut off, cut at (around) the 0.16mL mark.

Use medium-grit sand paper to smooth and square up the cut sides of the syringe.