I wonder if we should try to ask the folks at AP Photoplastics - who appear to be the worlds largest producers of Film cassetttes.
here is the email I just wrote to firstname.lastname@example.org :
There was a recent thread on the APUG website concerning the desire to have a small inexpensive device to trim the end of a roll of blk film to allow it to be attached to the spool on a reloadable film cassette.
It appears that your film is one of the leading makers of the cassettes.
The tread is at