The spool pin holds a thread spool on a homeowner machine but it serves as a guide on an industrial. Pass the thread through the upper hole first, from back to front (toward you).

A five-step guide (with a few tips and tricks) to help you learn how to thread a sewing machine By Daisy Murray Updated: 07 April 2021 ...

The spool pin holds a thread spool on a homeowner machine but it serves as a guide on an industrial. Pass the thread through the upper hole first, from back to front (toward you).