When I use a thread stand with one of my vintage machines, I put an ordinary size spool of thread onto the spool pin, on top of a felt ring.
I thread the machine from the thread stand to underneath the weighted-down felt ring to the next threading point for that machine.
You can buy replacement spool pins for some models which have threading holes drilled in the top - I like those, too.
You can also tape a large eye darning needle to the spool pin.