A #56 bit (smallest I could find) is slightly larger than the DCS-DC PCB holes. Found an old, cheap digital caliper (luckily the battery worked) which measured just over 0.040", very close to that looking through a microscope. The pin header I have is right at 0.025" and it fits with room to spare. Can even be rotated or pushed off in any direction at an angle while stuck in the hole, so there is some slop.
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