File plastic 120 spools into 620greenspun.com : LUSENET : Brownie Cameras : One Thread
I have some 620 box brownies which I use 120 film in. Tip- Just file the 120 plastic spool diameter down (leaving the film on whilst doing it) to that of a 620 spool diameter. It pays to have a metal 620 take-up spool though.
-- Mike Le Fevre (email@example.com), May 12, 2001
I found this site which gives six different ways of doing this www.neocomm.net/~jmarshal/F_620.html
-- Mike Le Fevre (firstname.lastname@example.org), May 15, 2001.