Step 14
Mount the spacers with the nuts on PCB1. You can have the screw-side on PCB1 as well if you
feel that it's more comfortable.
Step 15
Put the pin & socket strips into each other. Place them between PCB1 and PCB2 in their
respective places.
Take a firm grip with a plier around the spacers and screw the
screws into place.
If the nuts gets loose, tighten them again.
Remove them again after the pin & socket strips are soldered.
Solder the connectors.