Spool Wire Holder for the Single Thread Embroidery Attachment theme-animal The part number that is

The part number that is significant is the Throat Plate

This particular one has the chromium finish and is complete with an original box

70+ years later

which also protects the finish of the machine's harp where the shaft rests when you reach back to adjust the motor height

For fabric requirements

Spool Wire Holder for the Single Thread Embroidery Attachment theme-animal The part number that isThis is a new replica spool wire holder to accommodate an embroidery thread spool when using the Single Thread Embroidery Attachment. The holder will slide into the oiling hole on the neck of the Machine. This is for the spool wire only. * SINGLE THREAD EMBROIDERY ATTACHMENT IS NOT INCLUDED.