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The cupped head of the pogo pin should be on top. When you mount the USB hub
under Raspberry Pi. The cupped head will contact to the +5V and GND pins in the
40-pin header.
Also the cupped head will contact to the D+ and D- at the bottom of a USB port on
Raspberry Pi.
Although the pogo pin has cupped head, which is helpful for aligning to the joint point,
it is still a challenge to align 4 of them a time. We found that following the steps below
could make things easier:
1. Fix the 4 standoffs under Raspberry Pi with the nuts.
2. Align the D+ and D- pogo pins to the 2 joint points under USB port.
