The jig is based on two pogo pins mounted directly across from each other on a scrap of single-clad PCB. The spring-loaded contacts, which short together when not in use, are pulled apart to load ...

While some keyboards like this might use a standard USB connection to join the two halves, the ZSA Voyager uses I2C instead and even breaks the I2C bus out with a pogo pin-compatible connector.

Same Sky has added 40 high-reliability models to its pogo pin selection. “The CPG family of pogo pins ... and some work over -40 to 85°C. Picking the CPG-11-SMT-B almost at random (left in the photo), ...