The first picture shows how the rig is built. The top PCB is the final carrier and takes the soldering. The lower PCB is there only as a guide, keeping the pins straight during the soldering process. The height of the top board is essential. It help to hold the rig down onto a flat surface while soldering…
The second image shows 15 pins soldered in, and a 16th pin waiting to be dropped all the way to the surface. Do not compress the spring while soldering!
The third image is the view from below with all pins soldered in. Remove the bottom template…
… and you will get this nicely alined straight and even length pogo pin board. Fit it into the holder and insert a print head. If the spring load is too high, add a washer to enlarge the distance to th printhead and reduce tension. One pogo pin is easy to compress, but 36 of them exert – um – 36 times the force.
Now, who’s going to solder in the wires and shoot the first droplet 😉 ?