I didn't want to solder headers on each of the three boards, as they will be a permanent installation.
I found these cool header pins in a broken VCR. They were used to attach the power supply board at a set height to the main board. I'm sure you can find something else that would work just as well.
With a coated paperclip (or a breadboard jumper, though these aren't as stiff), we can apply the header temporarily and securely.
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