This page is documenting the assembly of the wing pins, steps 1-4. The remaining steps involve actually inserting the wings and are documented on the next entry.
These steel pins have a long tube that houses a magnet epoxied into an aluminum bullet. When the pins are fully engaged, the magnet can be placed in close proximity to a pair of reed switches that will act as safety switches to tell the computer that the wings are installed. Of course, it’s perfectly possible to place the pins in the housings and thus close the switches even if the wings are in another hanger, but you probably won’t be trying to take off without the wings, so I guess the system is to make sure that they’re correctly installed.
Wing Locking Pins