Step 2Cutting.
The slot needs to be wide enough to slide the neck of the balloon into, and smooth enough to avoid snagging the balloon.
I cut into the pen with the saw, twice, then smoothed off the edges by trimming with a sharp craft knife.
Then, on the side of the pen that will end up at the bottom, I cut a wide, vaguely V-shaped notch to momentarily anchor the end of the balloon during knotting.
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