Which spool pin to use, or to use a thread stand, depends on what type of thread spool you use. If your thread is cross wound, you use the horizontal spool pin or a stand alone thread stand. You want the thread to come off the spool from the top without the spool itself moving. If your thread is straight wound so the spool itself spins as the thread unwinds, then you need to use the vertical spool pin on your machine or a thread stand like this -
https://allstitch.net/product/the-th...aptor-5861.cfm
Cari