Originally Posted by
redbugsullivan
You have my attention!! What is that?!? Details please, even if it is just a link.
www.ismacs.net/singer_sewing_machine_company/model-list/classes-1-99.html
Surprisingly, I did perform a Google search and it came up with nothing obvious, except patent details (I figured asking you would save the time of interpreting these)
EDIT: Did a search on models that have it and DL'd a manual for it. Here is a paragraph from a Singer industrial manual
[ATTACH=CONFIG]449344[/ATTACH]