i have a kodak box ( 1A ) that takes 116 spools.
it had film in it so i have the paper that has the frame #s ... 7 / roll ...even thought
i have 2 spools ( misplaced now ) and have successfully rolled my own 116 spools, i have also just made cardboard
disks and slid them between 120 spool-ends and the prong that holds the film in place.
it worked OK ....
take an old paper from a used 120 film spool wind it in your camera sans film
and see how many winds it takes to go 7 frames ..
you might also consider cutting small strips of paper
and making paper negatives
good luck !